3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
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3(x+y)-2(x-y)=114(x+y)+3(x-y)=93(x+y)-2(x-y)=114(x+y)+3(x-y)=93(x+y)-2(x-y)=114(x+y)+3(x-y)=93(x+y)-
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
3(x+y)-2(x-y)=11
4(x+y)+3(x-y)=9
令x+y=a,x-y=b,则原方程组变成：
3a-2b=11
4a+3b=9
解得：a=3,b=-1
即
x+y=3
x-y=-1
解得：x=1,y=2
x+5y=11;
7x+y=9;
x=1;y=2
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
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-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
(x+y)(x+2y)(x+3y)(x+4y)=-40y的值为根号11
根据3（x+y)-2(x-y)=11,4(x+y)+3(x-y)=9可得出x+y= ,x-y=
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)=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
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/x-x+y/y-(x+y)(x-y)/y² y/x=2
已知2y-x=-3,求[4y(2x-y)-2x(2x-y)]/(2x-y
x+y+2(-x-y+1)=3(1-y-x)-4-(y+x-1),x+y=?