(x+3)(x-3)(x²-9);(2x+y)²-(2x+3y)(2x-3y)
先化简再求值:(x-2y)²-(x+2y)(x-2y)-(x-3y)(x-y).其中x²+9y
(3x-y)²-2x(4x-5y)-(x+2y)²
先化简,在求值:(x-y)²+(3x-2y)(2x+y)-x(6x-y)
(x-y)(x-2y)-(3x-2y)(x-3y)
2(x-y)+3(x+y)2-5(x-y)-8(x+y)2-(x-y)
(X-3Y)(X+3Y)-(X+2Y)(X-4Y)-(2X-Y)2的平方
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)
3(x-2y)²+(x-2y)因式分解
3m(x-y)-2(y-x)²因式分解
2x²-3xy=y²=0(x,y不得o)求x/y+y/x
7x+[-3x-3(x-2y)]-[5x-(2x-y)]