已知x-y=-1⼀2,xy=4⼀1,求代数式-x^3+2x^2y^2-xy^3的值.

2024-12-05 07:36:43
推荐回答(1个)
回答1:

-x³y+2x²y²-xy³
=-xy(x²-2xy+y²)
=-xy(x-y)²
=-(-1/2)*(1/4)*(-1/2-1/4)
=1/8*(3/4)
=-3/32