3x-2y=3 2x+3y=2
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3x-2y=3 2x+3y=2
3x-2y=3 2x+3y=2
3x-2y=3 2x+3y=2
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
(x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
(x+y)(2x-3y)=?
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
已知x-y=3,求[(x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值
已知3x =2y 求x/x+y+y/x-y-y²/x²-y²
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
{(x+2)^2-(y-3)^2=(x+y)(x-y) {x-3y=2
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
2(x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
(-x+2y)(2x+y)-(2x+y)(y-2x)-3xy=?因式分解
计算:y(x-y)^2+(y-x)^3=?
y'=(2x+y)/(3x-y)微分方程通解
12y(x-y)^2-8(x-y)^3=?
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