二元一次方程组练习
题
快递公司问题件快递公司问题件货款处理关于圆的周长面积重点题型关于解方程组的题及答案关于南海问题
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二元一次方程组计算题 5(m,1),2(n,3)2p,3q,13,,1、 2、 ,,2(m,1),3(n,3),p,5,4q,,
112,uv,,10,x,y,,,3、 4、 535,325uv,,,,0.5x,0.3y,0.2,
mn,,,13,2314xy,,,,235、 6、 ,,mn3216xy,,,,,,3,34,
x,5y,0,2x,3y,8,7、 8、 ,,3x,2y,17,7x,5y,,5(,
mn,,,3,3x,2y,6,,34、9 10、; ,,2x,3y,17mn,,,,13,23,
x,y,1xyyx(,1),(1,),2,,,11、 12、 ,,2,x(x,1),y,x,02x,y,,4,,
x,11,,2y,,3(x,1),4(y,4),,3213、 14、 ,,xx,15(y,1),3(x,5),,,,1,23,
3x,13y,,16,x,2y,2,0,,,、 16、 15,,x,3y,2;7x,4y,,41;,,
5x,6y,15.2,3t,4s,14,,,17、 18、 ,,5t,4s,2;3x,2y,,0.4;,,
12,x,3y,,,2m,9n,4.8,,,2319、 20、 ,,3293m,5n,,15;,,x,y,,.,412,
ì321xy+=ïï19、 已知方程组的解x,y的值相等,求m 的值. íïmxmy++=24()ïî
ìxym+=7ïï 20、(8分)已知关于x,y的方程组的解是方程的一个解,求m 的值. 325xy+=íïxym-=11ïî
xy,5x,2y,7,,,,2 23( 24( ,,343x,4y,,1,,3(y,5),5(x,1),
0.2x,0.5y,0.2,,3x,4y6x,5y,,1( 26、 25,230.4x,0.1y,0.4;,
四.若方程组与方程组的解相同,求a、b的值
mn,,,133()4()4xyxy,,,,,,,,23? ? ,xyxy,,,mn,,1,,,,326,,34,
x,y,52x,3y,,4,,? ? (代入法),,(x,2)a,2(y,2),x(a,3)5x,6y,,7,,
4x%,5(x,y)%,0.3,3x,2y5y,12x? ? ,,1,334y,3(x,y),6,
xy,,,0,? 32,
,2x,y,8,
16 求方程(2x-y)(x-2y)=5的正整数解。
x2mx+ny=11,是方程组1、若的解,求m、n的值。 ,,y17xny=5,,
三、解下列方程组(本大题共4小题。每小题3分,共12分)
xy=5,,3x2y6,,1、 2、 ,,3x+2y=102x+3y=17
237,x+yxy,,x+y=2,,+=154103、 4、 ,23,31314(x+y)5(xy)2,,,x+=y+,,,5542,
1(解下列方程组。
3x,2y,142x,5y,,21,,(1) (2) ,,x,y,34x,3y,23,,
xy,3(x,1),y,5,,,13,(3) (4) ,23,,5(y,1),3(x,5),xy,,,3,34,
6x,5y,15,(5) ,3x,y,,3,
y=3x3,,2x,5y,12,1( 2. ,,2x,3y,64x3y17,,,,
xy, ,,13,,233()4()4xyxy,,,,,,,3. 4. xyxyxy,,,,,,1,,3,26,,34,
x,y-z,2,3x,4y6x,5y,,,15 6. 3x,7y,3z,0,23,2x-5y,z,1,
2x,3y,152x,3y,7,,19( 20( ,,x,5y,12x,5y,,1,,
xy,5x,2y,7,,,,2 21( 22( ,,343x,4y,,1,,3(y,5),5(x,1),
y,1x,2,x,3y,2,,,(1) (2) 43,,y:x,3:4,,2x,3y,1,
x,y,35(为怎样的正整数时,方程组 的解是正数. ax,2y,a,3
23x,17y,632m,6n,3,,1、 2、 ,,3m,6n,617x,23y,57,,
2x,3y,k,四、已知方程组的x与y的和是 ,求k的值.(8分) ,12,3x,5y,k,1,
xy,,,3,3x,2y,8,,23(1) (2) ,,y,5y,4x,7,,x,3y,9,,3,
xy,6s,27,5t,,,2, (1) (2) 34,,3s,18,4t,,3x,4y,,7,
(1) (2)
(3) (4)
(1) (2)
(3) (4)
(1) (2) (3)
(4) (5) (6)
(7) (8)
(9) (10)
21xy,,2216xy,,,,(1)用代入法解方程组 (2) 用加减法解方程组 ,,xy,,22xy,,12,,
xy,,,13,0.10.32.5xy,,,,233) (4) ,,xy0.10.12.1xy,,,,,,3,34,
3x,4y,11,3214xy,,,
,,13、 14、 2x,4y,,6xy,,3,,
3()4()4xyxy,,,,,
5x,6y,9,,
xyxy,,,,15、 16、 ,,17x,4y,,5,,26,
2x,3y,54x,y,17x,3y,1,0,,,1、 2、 3、 ,,,x,2y,162x,y,,54x,5y,,17,,,
mn,x,yx,y5x,3y,1,,13,,,,,6,,2,,,23 4、 5、 6、 23118,,,mn,,,,,3x,y,,14(x,y),5(x,y),2,,,34,
223a,b,c 2、已知,求的值. (a,2b,4),(2b,c),|a,4b,c|,0