初中数学计算题(200道)

------------------------------------------作者xxxx------------------------------------------日期xxxx初中数学计算题(200道)【精品文档】【精品文档】【精品文档】【精品文档】【精品文档】【精品文档】初中数学计算题（200道）(-1.5)×(-9)-12÷(-4)56÷(-7)-2÷5+0.43.57×29÷(-4)5.6÷(-2.8)-(-50)÷2[9.6+(-7.3)]×[(-5)-(-7)]12.3÷[5.6+(-1.2)](-75.6)÷(1/4+1/5)9.5×(-9.5)÷1/295.77÷(-2)+(-34.6)(-51.88)÷2-(-5)×241.25*（-3）+70*（-5）+5*（-3）+259999*3+101*11*(101-92)(23/4-3/4)*(3*6+2)3/7×49/9-4/38/9×15/36+1/2712×5/6–2/9×38×5/4+1/46÷3/8–3/8÷64/7×5/9+3/7×5/95/2-（3/2+4/5）7/8+（1/8+1/9）9×5/6+5/63/4×8/9-1/37×5/49+3/146×（1/2+2/3）8×4/5+8×11/531×5/6–5/69/7-（2/7–10/21）5/9×18–14×2/74/5×25/16+2/3×3/414×8/7–5/6×12/1517/32–3/4×9/243×2/9+1/35/7×3/25+3/73/14×2/3+1/61/5×2/3+5/69/22+1/11÷1/25/3×11/5+4/345×2/3+1/3×157/19+12/19×5/61/4+3/4÷2/38/7×21/16+1/2101×1/5–1/5×2150＋160÷40120-144÷18+35347+45×2-4160÷5237×（58+37）÷（64-9×5）95÷（64-45）178-145÷5×6+42812-700÷（9+31×11）85+14×（14+208÷26）120-36×4÷18+35（58+37）÷（64-9×5）(6.8-6.8×0.55)÷8.50.12×4.8÷0.12×4.8×1.5+2.5）÷1.66-1.6÷4=5.38+7.85-5.37=7.2÷0.8-1.2×5=6-1.19×3-0.43=××4）=××3.74÷3.2）×2.5[（7.1-5.6）×0.9-1.15]÷2.5÷×（3.7-2.9）+0.62]12×6÷（12-7.2）-6-60.68×1.9+0.32×1.958+370）÷（64-45）420+580-64×21÷28136+6×（65-345÷23）15-10.75×0.4-5.7÷0.23）×1(6.8-6.8×0.55)÷8.50.12×4.8÷0.12×4.8×1.5+2.5）÷1.6×6+（1.5+2.5）÷1.60.68×1.9+0.32×1.910.15-10.75×0.4-5.7×（3.87-0.13）+4.2×3.74÷3.2）×2.5[（7.1-5.6）×0.9-1.15]÷2.5÷×（3.7-2.9）+0.62]12×6÷（12-7.2）-612×6÷7.2-633.02－（148.4－90.85）÷2.576.(25%-695%-12%)*3677./4*3/5+3/4*2/578.1-1/4+8/9/7/979.+1/6/3/24+2/2180./15*3/581.3/4/9/10-1/682./3+1/2)/5/6-1/3]/1/783./5+3/5/2+3/484.(2-2/3/1/2)]*2/585.+5268.32-256986.3+456-52*887.5%+632588./2+1/3+1/489+456-785%+.3/7×49/9-4/39×15/36+1/272×5/6–2/9×33×5/4+1/494÷3/8–3/8÷695/7×5/9+3/7×5/96/2-（3/2+4/5）8+（1/8+1/9）8×5/6+5/61/4×8/9-1/310×5/49+3/141.5×（1/2+2/3）2／9×4/5+8×11/53.1×5/6–5/64/7-（2/7–10/21）19×18–14×2/75×25/16+2/3×3/44×8/7–5/6×12/157/32–3/4×9/242/3÷1/2－1/4×2/52－6/13÷9/26－2/32/9＋1/2÷4/5＋3/810÷5/9＋1/6×41/2×2/5＋9/10÷9/205/9×3/10＋2/7÷2/51/2＋1/4×4/5－1/83/4×5/7×4/3－1/223－8/9×1/27÷1/278×5/6＋2/5÷41/2＋3/4×5/12×4/58/9×3/4－3/8÷3/45/8÷5/4＋3/23÷9/111.2×2.5+0.8×2.58.9×1.25-0.9×1.2512.5×7.4×0.8×6.4-（2.5+0.24）××0.50.35×1.6+0.35×3.40.25×8.6×46.72-3.28-1.720.45+6.37+4.55×3-（25-2.5）2×41846-620-3804.8×46+4.8×540.8+0.8×2.51.25×3.6×8×2.5-12.5×2.428×12.5-12.5×2023.65-（3.07+3.65）×0.25）8×7×1.251.65×99+1.6527.85-（7.85+3.4）48×1.25+50×1.25×0.2×87.8×9.9+0.78(1010+309+4+681+6）×123×9146×782×6×8545.15×7/8+6.1-0.606253/7×49/9-4/38/9×15/36+1/2712×5/6–2/9×38×5/4+1/46÷3/8–3/8÷64/7×5/9+3/7×5/95/2-（3/2+4/5）7/8+（1/8+1/9）9.9×5/6+5/63/4×8/9-1/37×5/49+3/146×（1/2+2/3）8×4/5+8×11/531×5/6–5/69/7-（2/7–10/21）5/9×18–14×2/74/5×25/16+2/3×3/414×8/7–5/6×12/1517/32–3/4×9/243×2/9+1/35/7×3/25+3/73/14×2/3+1/61/5×2/3+5/69/22+1/11÷1/25/3×11/5+4/345×2/3+1/3×157/19+12/19×5/61/4+3/4÷2/38/7×21/16+1/2101×1/5–1/5×2150＋160÷40（58+370）÷（64-45）120-144÷18+35347+45×2-4160÷52（58+37）÷（64-9×5）95÷（64-45）178-145÷5×6+42420+580-64×21÷28812-700÷（9+31×11）（136+64）×（65-345÷23）85+14×（14+208÷26）（284+16）×（512-8208÷18）120-36×4÷18+35（58+37）÷（64-9×5）(6.8-6.8×0.55)÷8.50.12×4.8÷0.12×4.8×1.5+2.5）÷×（1.5+2.5）÷1.66-1.6÷45.38+7.85-5.377.2÷0.8-1.2×56-1.19×3-0.43××4）0.68×1.9+0.32×1.948.10.15-10.75×0.4-5.7××3.74÷3.2）×2.551.[（7.1-5.6）×0.9-1.15]÷2.5÷×（3.7-2.9）+0.62]×6÷（12-7.2）-6（4）12×6÷7.2-6102×(-4.5)-(-3)×(-5)÷2××6.9(-2)+2-(-52)×(-1)×5+87÷(-3)×(-1)××（20－1.25）(-7.1)×〔(-3)×(-5)〕÷2-2.5×(-4.8)×(0.09)÷(-0.27)127+352+73+44×(-2)89×276+(-135)-3325×71+75÷29-88÷(-2)243+89+111+579405-2940÷28×21920-1680÷40÷7690+47×52-398148+3328÷64-75360×24÷32+7302100-94+48×5451+（2304-2042）×234215+（4361-716）÷81（247+18）×27÷2536-720÷（360÷18）1080÷（63-54）×80（528+912）×5-61788528÷41×38-904264+318-8280÷69（174+209）×26-(9000^0)814-（278+322）÷151406+735×9÷453168-7828÷38+504796-5040÷（630÷7）285+（3000-372）÷361+5/6-19/123x(-9)+7x(-9)(-54)x1/6x(-1/3)÷0.23）×12.(6.8-6.8×0.55)÷8.5×4.8÷0.12×4.843.2×1.5+2.5÷(-1.6)（-2）××（1.5+2.5）÷1.65.6-1.6÷4+(6.8-9)5.37÷89÷0.8-1.2×56-1.19×3-0.43××4）0.68×1.9+0.32×1.9-10.75×0.4-5.7×（3.87-0.13）(-8.01)+4.2×3.74÷3.2）×2.511.[（7.1-5.6）×0.9-1.15]÷2.5÷×（3.7-2.9）+0.62]×6÷（12-7.2）-614.12×6÷7.2-6－（148.4－90.85）÷2.5(-5)-252×（-78）(-6)×(-2)+3÷（5+50）7-7+3-6-（-90）(-8)(-3)×(-8)×25(7+13)÷(-616)÷(-28)（8+14-100-27）÷4(-15)÷(-1)-101÷1016÷0.21×(-8)×(4.1+5.9)(-10)×(-2)×4÷{-9÷[6+(-5.67)]}(-18)(-4)2×[8.01×(-3.14)9-32{-890-[79+8.1]×9}(-20)-23+(-9)×9.42(-24)3.4×104÷(-5)×200.96[-|98|+76+(-87)]*23[56+(-75)-(7)]-(8+4+3)5+21*8/2-6-5968/21-8-11*8+61-2/9-7/9-564.6-(-3/4+1.6-4-3/4)1/2+3+5/6-7/12[2/3-4-1/4*(-0.4)]/1/3+222+(-4)+(-2)+4*3-2*8-8*1/2+8/1/8(2/3+1/2)/(-1/12)*(-12)(-28)/(-6+4)+(-1)+√92/(-2)+0/7-(-8)*(-2)(1/4-5/6+1/3+2/3)/1/218-6/(-3)*(-2)×2^7(5+3/8*8/30/(-2)-√36(-84)/2*(-3)/(-6)1/2*(-4/15)/2/31+2+3+4+......+1000001/1+1/2+1/3+......1/501+1/2+1/4+1/8+1/16+......1/5123+9+27+81+243+......99991+1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/908－2×32－(-2×3)2–12×(-3)2－(-1/2)2003×(-2)2002÷2/9(0.5-3/2)÷3/1×[-2-(-3)3]－∣∣[-38-(-1)7+(-3)8]×-53a^3-2b^3+ab(2a-b)-√a-b^215*(-8)+2b^2+(x^2+y^2)^2-4y(x^2+y^2)+4y^26-3a^8-(-5^2-6)(x^2+2x)^2+3(x^2+2x)+x^2+2x+3(a+1)(a+2)+(2a+1)(a-2)-12x^2(y+z)^2-2xy(x-z)(y+z)+y^2(x-z)^23(a+2)^2+28(a+2)-20(a+b)^2-(b-c)^2+a^2-c^28x(x+1)(x^2+x-1)-2x^2(x-1)^2-3(x^2-x)-5614a(a-b)+(a-b)^211.-ab(a-b)^+a(b-a)^212.3（x+2）－2x=5－4x13.5（x+2a）-a=2（b-2x）+4a3.14*3.42(2)972*3.14*1/4[-|98|+76+(-87)]*23[56+(-75)-(7)]-(8+4+3)5+21*8/2-√121-5968/21-8-11*8+61-2/9-7/9-564.6-(-3/4+1.6-4-3/4)1/2+3+5/6-7/12[2/3-4-1/4*(-0.4)]/1/3+222+(-4)+(-2)+4*3-2*8-8*1/2+8/1/8(2/3+1/2)/(-1/12)*(-12)(-28)/(-6+4)+(-1)2/(-2)+0/7-(-8)*(|-2|-5^4)(1/3+2/3)/1/2-|-9+(-5)|18-6/(-3)*(-2)-|-9|(5+3/8*8/30/(-2)-3(-84)/2*(-3)/(-6)1/2*(-4/15)/2/3|-3x+2y-5x-7y|-|-9x+2y|-5+21*8/2-6-5968/21-8-11*8+61-2/9-7/9-564.6-(-3/4+1.6-4-3/4)1/2+3+5/6-7/12[2/3-4-1/4*(-0.4)]/1/3+222+(-4)+(-2)+4*3-√64-5^2-2*8-8*1/2+8/1/8(2/3+1/2)/(-1/12)*(-12)(-28)/(-6+4)+(-1)2/(-2)+0/7-(-8)*(-2)(1/4-5/6+1/3+2/3)/1/218-6/(-3)*(-2)(5+3/8*8/30/(-2)-3(-84)/2*(-3)/(-6)1/2*(-4/15)/2/3+√9-3x+2y-5x-7y+-5+21*8/2-6-5968/21-8-11*8+61-2/9-7/9-56(-3/4+1.6-4-3/4)1/2+3+5/6-7/12[2/3-4-1/4*(-0.4)]/1/3+222+(-4)+(-2)+4*3-2*8-8*1/2+8/1/8(2/3+1/2)/(-1/12)*(-12)(-28)/(-6+4)+(-1)2/(-2)+0/7-(-8)*(-2)(1/4-5/6+1/3+2/3)/1/218-6/(-3)*(-2)(5+3/8*8/30/(-2)-3(-84)/2*(-3)/(-6)1/2*(-4/15)/2/3-3x+2y-5x-7y-(-3^2+5^7)-1+2-3+4-5+6-7+√9-50-28+(-24)-(-22)-19.8-(-20.3)-(+20.2)-10.8;0.25-+(-1)-(+3).-1-23.33-(+76.76)1-2*2*2*2-5^2+(6^2-5^2)(-6-24.3)-(-12+9.1)+(0-2.1)-1+8-7+5^7-(-5+√9)125*3+125*5+25*3+259999*3+101*11*(101-92)(23/4-3/4)*(3*6+2)3/7×49/9-4/38/9×15/36+1/2712x*5/6y–2/9y*|3x-2y|8×5/4+1/4*|-7-8|6÷3/8–3/8÷64/7×5/9+3/7×5/95/2-（3/2+4/5）7/8+（1/8+1/9）9×5/6+5/63/4×8/9-1/37×5/49+3/146×（1/2+2/3）8×4/5+8×11/531×5/6–5/69/7-（2/7–10/21）5/9×18–14×2/74/5×25/16+2/3×3/414×8/7–5/6×12/1517/32–3/4×9/243^45×2/9+1/35/7×3/25+3/73/14×2/3+1/61/5×2/3+5/65/3×11/5+4/39/22+1/11÷1/2-√16945^8×2/3+1/3×157/19+12/19×5/61/4+3/4÷2/38/7×21/16+1/2101^4×(-1/5–1/5×21)50＋√160÷40^5120-144÷18+35347+45×2-4160÷5237^2（58+37）÷（64-9×5）95÷（64-45）178-145÷5×6+42812-700÷（9+31×11）85+14×（14+208÷26）120-36×4÷18+35（58+37）÷（64-9×5）(6.8-6.8×0.55)÷8.50.12×4.8÷0.12×4.8×1.5+2.5）÷1.66-1.6÷4=5.38+7.85-5.37=7.2÷0.8-1.2×5=6-1.19×3-0.43=××4）=××3.74÷3.2）×2.5[（7.1-5.6）×0.9-1.15]÷2.5÷×（3.7-2.9）+0.62]12×6÷（12-7.2）-612×6÷7.2-60.68×1.9+0.32×1.958+370）÷（64-45）420+580-64×21÷28136+6×（65-345÷23）15-10.75×0.4-5.7÷0.23）×1(6.8-6.8×0.55)÷8.50.12×4.8÷0.12×4.8×1.5+2.5）÷1.6×6+（1.5+2.5）÷1.60.68×1.9+0.32×1.910.15-10.75×0.4-5.7××3.74÷3.2）×2.5[（7.1-5.6）×0.9-1.15]÷2.5÷×（3.7-2.9）+0.62]12×6÷（12-7.2）-612×6÷7.2-633.02－（148.4－90.85）÷2.576.(25%-695%-12%)*367/4*3/5+3/4*2/51-1/4+8/9/7/97+1/6/3/24+2/218/15*3/53/4/9/10-1/68/3+1/2)/5/6-1/3]/1/79/5+3/5/2+3/48^6(2-2/3/1/2)]*2/58+5268.32-25693+456-52*887.5%+63258/2+1/3+1/489+456-785%+.3/7×49/9-4/39×15/36+1/272×5/6–2/9×33×5/4+1/494÷3/8–3/8÷695/7×5/9+3/7×5/96/2-（3/2+4/5）8+（1/8+1/9）8×5/6+5/61/4×8/9-1/310×5/49+3/141.5×（1/2+2/3）2／9×4/5+8×11/53.1×5/6–5/64/7-（2/7–10/21）19×18–14×2/75×25/16+2/3×3/44×8/7–5/6×12/157/32–3/4×9/242/3÷1/2－1/4×2/52－6/13÷9/26－2/32/9＋1/2÷4/5＋3/810÷5/9＋1/6×41/2×2/5＋9/10÷9/205/9×3/10＋2/7÷2/51/2＋1/4×4/5－1/83/4×5/7×4/3－1/223－8/9×1/27÷1/2718×5/6＋2/5÷411/2＋3/4×5/12×4/58/9×3/4－3/8÷3/45/8÷5/4＋3/23÷9/111.2×2.5+0.8×2.58.9×1.25-0.9×1.2512.5×7.4×0.8×6.4-（2.5+0.24）6.5×9.5+6.5×0.50.35×1.6+0.35×3.40.25×8.6×46.72-3.28-1.720.45+6.37+4.55×3-（25-2.5）2×41846-620-3804.8×46+4.8×540.8+0.8×2.51.25×3.6×8×2.5-12.5×2.428×12.5-12.5×2023.65-（3.07+3.65）×0.25）8×7×1.251.65×99+1.6527.85-（7.85+3.4）48×1.25+50×1.25×0.2×87.8×9.9+0.78(1010+309+4+681+6）×123×9146×782×6×8545.15×7/8+6.1-0.606253/7×49/9-4/38/9×15/36+1/2712×5/6–2/9×38×5/4+1/46÷3/8–3/8÷64/7×5/9+3/7×5/95/2-（3/2+4/5）7/8+（1/8+1/9）9×5/6+5/63/4×8/9-1/37×5/49+3/146×（1/2+2/3）8×4/5+8×11/531×5/6–5/69/7-（2/7–10/21）5/9×18–14×2/74/5×25/16+2/3×3/414×8/7–5/6×12/1517/32–3/4×9/243×2/9+1/35/7×3/25+3/73/14×2/3+1/61/5×2/3+5/69/22+1/11÷1/25/3×11/5+4/345×2/3+1/3×157/19+12/19×5/61/4+3/4÷2/38/7×21/16+1/2101×1/5–1/5×2150＋160÷40（58+370）÷（64-45）120-144÷18+35347+45×2-4160÷52（58+37）÷（64-9×5）95÷（64-45）178-145÷5×6+42420+580-64×21÷28812-700÷（9+31×11）（136+64）×（65-345÷23）85+14×（14+208÷26）（284+16）×（512-8208÷18）120-36×4÷18+35(58+37）÷（64-9×5）(6.8-6.8×0.55)÷8.50.12×4.8÷0.12×4.8×1.5+2.5）÷1.6×（1.5+2.5）÷1.66-1.6÷4=5.38+7.85-5.37=7.2÷0.8-1.2×5=6-1.19×3-0.43=××××1.910.15-10.75×0.4-5.7××3.74÷3.2）×2.5[（7.1-5.6）×0.9-1.15]÷2.5÷×（3.7-2.9）+0.62]12×6÷（12-7.2）-6（4）12×6÷7.2-6102^2×4.5+8^5-√529××6.95.6×0.258×（20－1.25）127+352+73+4489+276+135+3325+71+75+29+88243+89+111+579405-2940÷28×21920-1680÷40÷7690+47×52-398148+3328÷64-75360×24÷32+7302100-94+48×5451+（2304-2042）×234215+（4361-716）÷81（247+18）×27÷2536-720÷（360÷18）1080÷（63-54）×80（528+912）×5-61788528÷41×38-904264+318-8280÷69（174+209）×26-9000814-（278+322）÷151406+735×9÷453168-7828÷38+504796-5040÷（630÷7）285+（3000-372）÷361+5/6-19/123x(-9)+7x(-9(-54)x1/6x(-1/3)÷0.23）×1(6.8-6.8×0.55)÷8.50.12×4.8÷0.12×4.8×1.5+2.5）÷1.6×（1.5+2.5）÷1.65.6-1.6÷45.38+7.85-5.377.2÷0.8-1.2×56-1.19×3-0.43××4）0.68×1.9+0.32×1.9115-10.75×0.4-5.7××3.74÷3.2）×2.5[（7.1-5.6）×0.9-1.15]÷2.5÷×（3.7-2.9）+0.62]12×6÷（12-7.2）-612×6÷7.2-633.02－（148.4－90.85）÷2.5二.解方程2x=7(x-5)8(3x+3)=2404.74+4x-2.5x=8.1(2.81+x)÷2.81=115x-30=16(x-2)(-3)^3-3^3(-1)^2-5.62^2+3^3-4^4(2^4-3^2)^3-5^5[(1.6^2-2^3)-2.1]^2(5.66×2)^2-15^2(-15)^x=225,x=?[(-4)^2-4^2]×2^2[(-5.6)^2+3]^2[5.6^2+(-5.6)^2]×(-1)^23x+28-x=561.5x+6=3.752(3.6x+2.8)=-1.69.5x+9.5=1918(x-35)=-36x+7-(-36+8^2)/2=8+7^4/3a-7-98+7a=3.2*5a89/2+35/6x=3*9+2^3/5+7x3X+189/3=521/24Y+119*^3=22/113X*189=5*4^5/38Z/6=458/53X+77=594Y-6985=8187X*13=57Z/93=4115X+863-65X=5458Y*55=274897(2x-1)-3(4x-1)=4(3x+2)-1(5y+1)+(1-y)=(9y+1)+(1-3y)[-6(-7^4*8)-4]=x+220%+(1-20%)(320-x)=320×40%2(x-2)+2=x+12(x-2)-3(4x-1)=9(1-x)11x+64-2x=100-9x15-(8-5x)=7x+(4-3x)3(x-7)-2[9-4(2-x)]=223/2[2/3(1/4x-1)-2]-x=22x+7^2=1571)判断题：判断下列方程是否是一元一次方程：①-3x-6x2=7()③5x+1-2x=3x-2()④3y-4=2y+1.()判断下列方程的解法是否正确：①解方程3y-4=y+3解：3y-y=3+4,2y=7,y=3.5②解方程：0.4x-3=0.1x+2解：0.4x+0.1x=2-3;0.5x=-1,x=-2③解方程解：5x+15-2x-2=10,3x=-3,x=-1;④解方程解：2x-4+5-5x=-1,-3x=-2,x=.()2)填空题：（1)若2（3-a）x-4=5是关于x的一元一次方程，则a≠_（2）关于x的方程ax=3的解是自然数，则整数a的值为_（3）方程5x-2(x-1)=17的解是_（4）x=2是方程2x-3=m-的解，则m=_.（5）若-2x2-5m+1=0是关于x的一元一次方程，则m=_.（6）当y=_时，代数式5y+6与3y-2互为相反数.（7）当m=_时，方程的解为0.（8）已知a≠0.则关于x的方程3ab-(a+b)x=(a-b)x的解为______.3)选择题：（1）方程ax=b的解是（）.A．有一个解x=B．有无数个解C．没有解D．当a≠0时，x=（2）解方程(x-1)=3,下列变形中，较简捷的是（）A.方程两边都乘以4，得3（x-1）=12B.去括号，得x-=3C.两边同除以，得x-1=4D.整理，得（3）方程2-去分母得（）A.2-2(2x-4)=-(x-7)B.12-2(2x-4)=-x-7C.12-2(2x-4)=-(x-7)D.以上答案均不对（4）若代数式比大1，则x的值是（）.A．13B．C．8D．（5）x=1.5是方程（）的解.A.4x+2=2x-(-2-9)B．2{3[4(5x-1)-8]-2}=8C.4x+9=6x+64)解答下列各题：（1）x等于什么数时，代数式的值相等？（2）y等于什么数时，代数式的值比代数式的值少3？（3）当m等于什么数时，代数式2m-的值与代数式的值的和等于5？（4）解下列关于x的方程：①ax+b=bx+a;(a≠b);三.化简、化简求值化间求值:1、-9(x-2)-y(x-5)（1）化简整个式子。（2）当x=5时，求y的解。2、5(9+a)×b-5(5+b)×a（1）化简整个式子。（2）当a=5/7时，求式子的值。3、62g+62(g+b)-b（1）化简整个式子。（2）当g=5/7时，求b的解。4、3(x+y)-5(4+x)+2y（1）化简整个式子。5、(x+y)(x-y)（1）化简整个式子。6、2ab+a×a-b（1）化简整个式子。7、5.6x+4(x+y)-y（1）化简整个式子。8、6.4(x+2.9)-y+2(x-y)（1）化简整个式子。9、(2.5+x)(5.2+y)（1）化简整个式子。10、9.77x-(5-a)x+2a（1）化简整个式子。把x=-2,y=0.1,a=4,b=1代入下列式子求值3(x+2)-2(x-3)5(5+a)×b-5(5+b)×a62a+62(a+b)-b3(x+y)-5(4+x)+2y(x+y)(x-y)2ab+a×a-b5.6x+4(x+y)-y6.4(x+2.9)-y+2(x-y)(2.5+x)(5.2+y)9.77x-(5-a)x+2a