请求几道数学题,化简:[-2(x-y)]^4·[二分之一(y-x)]²化简:-3(a-b)²·[2(
请求几道数学题,化简:[-2(x-y)]^4·[二分之一(y-x)]²化简:-3(a-b)²·[2(
请求几道数学题啊,1.16m²-4n²2.4(x-y)三次方-8x(x-y)²3.a的四次
化简:1.2x²-y²+(2y²-3x²)-(2y²+x²)
代数式3x²y,-2xy²,二分之一xy,-x²y,3x中,与5x²y是同类项的
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y.若x
已知多项式A=x²+2y²-z²,B=-4x²+3y²+2z²
(3x-2y)²(3x-2y)²(9x²+4y²)²
帮我化简2道数学题①2a(a-b)³-a²(a-b)²②7y(x-3y)²-2(
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若|
设A=2x²-3xy+y²-x+2y ,B=4x²-6xy+2y²+3x-y .
已知a=2x²-3xy+y²,b=x²+2xy-3y²,化简:(1)a+b (2
已知多项式A=x²+2y+z²,B=-4x²+3y²+2z²,且A+B