计算 1.(-3xy)乘以y²-(-2xy²)²+(-2x)²乘以(-y)的四次
(xy-x²)除以xy分之x²-2xy+y²乘以x²分之x-y
计算(2X的平方Y-XY)乘以3XY等于多少
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
(xy-x^2)乘以(xy)/(x-y)
计算:(-7x²y)(2x²y-3xy³+xy)
若多项式5x的m次方乘以y的平方-(m+2)xy-y的3次方+6是四次三项是,试求m的值
计算;(xy-x²)÷x²-2xy+y²/xy · x-y/x²
x+y=3,xy=-2,试求代数式(1)(x-y)²; (2) x的四次方+y的四次方的值.
计算:(-2x的平方y的3次方)的平方乘以(xy)的3次方
已知(x+2)的四次方+y-1的绝对值=0,求5xy-【4x²y-(-3xy²+2x²+2
计算 (x²+2xy+y²)(x²-xy+y²)²
计算:(xy-x²)乘 x-y分之xy