-2x^3+8x^2-8xy^2
3x-2xy-8-2x+6xy-x²+6、-x²+2xy-y²-3x²-2xy+
分解因式(x^2+3x+2)(3+8x+4x^2)-90xy(xy+1)+(xy+3)-2(x+y+0.5)-(x+y-
(8xy-3x平方)-5xy-2(3xy-2x平方),其中,x=2,y=-1
计算.3x平方+{2X平方-3X}-{-X+5X的平方} 其中X=314 {5XY-8X平方}-{-12X平方+4XY}
因式分解:3x^2y+6xy-4x-8
因式分解 3x^2-6xy-4x+8y
因式分解:8(x-2y)-x(7x+y)+xy.
(x+2)(x+3)+x^2-5x-8 x^3-x^2y-xy^2+y^3 18x^2-21xy+5y^2因式分解(写出
(1) -3X^-2XY-8XY-(-5Y^2)-2X^2-Y^2
已知x-xy=8,xy-y=-9,求x+y-2xy的值
xy/3x+2y=1/8 xy/2x+3y=1/7
-4x²y-8xy²+2x²y-3xy²