化简 初中数学题目(x+y)(x—y)+(x—y)+(x+y)
初中数学分式已知x/y=2,求(x*x-xy+3y*y)/x*x+xy+6y*y的值
2.(x+y)²(x-y)²-(x-y)(x+y)(x²+y²)
用行列式性质计算(需过程):(x,y,x+y; y,x+y,x; x+y,x,y )
(x-y/x+2y)³
-{-[-(x-y)]}+{-[(x+Y)]}
数学因式分解计算题[(-x+y)/ (x²-y²)] - [(-x-y)/ (x+y)²]
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
x根号x+x根号y/xy-y^2)-(x+根号xy+y/x根号x-y根号)y
(x+y)^5+2(-x—y)^3·(x+y)²;
(x+y)(x²-xy+y²)—xy(x+y)因式分解
初中数学整式加减问题已知x-y=2,y+z=3,求多项式(x-y)²+(x+z)²-(y+z)&su
(x+y)²(x-y)+(x+y)(x-y)²