化简 (x-3)-(x^2+3x-2) 5(2x-y)-3(-x+2y)
化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
2(x-y)+3(x+y)2-5(x-y)-8(x+y)2-(x-y)
7x+[-3x-3(x-2y)]-[5x-(2x-y)]
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)
计算:(3x-y)2-(2x+y)2+5x(y-x)
数学(x-y)^5*(y-x)^3*(x-y)^2
(3x-y)²-2x(4x-5y)-(x+2y)²
化简:[(x+2y)^2-(x+y)(3x-y)-5y^2]/2x
((x+2y)x^2+(x-y)(3x-y)-5y^2)÷2x
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
-(5x+y)-3(2x-3y)(化简)
(x-y)(x-2y)-(3x-2y)(x-3y)