-a^2×(-a)^2n+2=____(n是整数) 若x-y=2,xy=3则x^2y-xy^2=___
问题描述:
-a^2×(-a)^2n+2=____(n是整数) 若x-y=2,xy=3则x^2y-xy^2=___
答
1、-a^(2n+4)
2、x^2y-xy^2=xy(x-y)=3*2=6