作业帮2x-y=5.⑴ 3x+4y=2...⑵
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2x-y=5.⑴ 3x+4y=2...⑵
2x-y=5.⑴ 3x+4y=2...⑵
2x-y=5.⑴ 3x+4y=2...⑵
1）×4得：
8x-4y=20……（3）
3x+4y=2……（2）
（2）+（3）得：
11x=22
∴x=2
将x=2代入（2）得：6+4y=2
4y=-4
∴y=-1
∴方程的解为x=2.y=-1
解方程组⑴(x+y)/2-(x-y)/3=6,⑵3(x+y)=4(x-y)
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
2x-y=5.⑴ 3x+4y=2...⑵
2（x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
（x+y）/2- x-y/2=6 3(x+y)=4(x-y)
x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
{(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=?
已知2y-x=-3,求[4y(2x-y)-2x(2x-y)]/(2x-y