计算:(a-b)(x-y)-(b-a)(x+y) 4+12(x-y)+9(x-y)²
计算:(a-b)(x-y)-(b-a)(x+y) 4+12(x-y)+9(x-y)²
(x-y)³-x+y (a+b)²-(a-b)² (x-3)³-4x+12
通分x/a(x-y),y/b(y-x) 通分 a/(y-x)的平方,b/(x-y)*(x+y)
因式分解(a-b)²(x-y)-(b-a)(y-x)²=(a-b)(x-y)×( )
下列能用平方差公式计算的是() A(-x+y)(x-y) B.(x-1)(-1-x) C.(2x+y)(2y-x) D.
计算(x-y)(y-x)²·(x-y)³;(b-a)(a-b)³(a-b)的5次方.
利用乘法公式计算(x+y)(x²+y²)(x-y)(x的四次方+y四次方)(a-2b+3)(a+2b
对于有理数a,b,定义:a*b=3a-2b,若x,y均为有理数,试计算【(x+y)*(x-y)】*2 x.
化简(-y-2/x)÷(x+2/y)的结果 【备用选项 A.-y/x B.-x/y C.x/y D.y/x 】 好了再加
3a(x+y)-2b(x+y)=(x+y)(?)
因式分解a(x-y)+b(y-x)+c(x-y)
设集合A={(x,y)|y≥|x-2|,x>=0},B ={(x,y)|y