3x+3*(4x+3y)=33 4x+3y=10 解这个方程顺便把2y+5*(4x+3y)=33 4x+3y=10 解这个方程
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(y-x)+x(x-y)^3-(y-x)^4 因式分解
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
x/3=y/4,求(x*x-xy)/(x*x+y*y)的值
x+3y/y-x,其中x=-4,
计算 3x+4y/x-y+3y/y-x-4x/x-y
3x+4y/x-y +3y/y-x -4x/x-y
x(4y-x)(x-3y)+y(3y-x)(x-4y)因式分解
(3x-y)(y+3x)-(4x-3y)(4x+3y)=?
{3(x+y)+3(y+x)=1,3(x+y)+4(y-x)=-1
2(x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
(5x+3y)(3y-5x)-(4x-y)(4y+x)=
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
x(x-3y)=4y(x-3y),求x:y
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11