{y-2x=1,x+2y=2{x+y=3,2x-3y=6 图像法解方程
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
用图像法解方程组3x+y=6,2x-y=-1
用图像法解方程组 x+2y=3 6x-5y=1
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
解方程x+y+(x+y/2)=15 3x+5y+4(x+y/2)=62
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
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