①5x³(-2x²y)②-3x²(-x²y+2y-1)③a²(a-1)
(1)下列是反比例函数的是:①y=2x②y=-2x+2③y=4/x④y=-2/x²⑤y=a/x⑥y=π/x
已知x=1/y,则(x-1/x)(y-1/y)等于 A、2x² B、2y² C、x²+y&
先化简再求值:(x-2y)²-(x+2y)(x-2y)-(x-3y)(x-y).其中x²+9y
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
(x-y)的四次方(x-y)-2(x-y)²(y-x)³等于?
若集合A={(x,y)/x²+y²=1},B={(x,y)/y²=2(x+)},则A∩B=
因式分解1.2(x-y)²-x+y 2.81-9x² 3.-2a³+12a²-1
已知集合A={x|-1≤x≤3) B=(y|y=x²,x属于A) C=(y|y=2x+a,x属于A)若满足 C
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
(3x-y)²-2x(4x-5y)-(x+2y)²
计算,不要过程(-2x)(-3x²)²-3a(2a²-5a-1)(2x+3y)(2x-3y