(a-b)的三次方乘(b-a)的五次方
=(a-b)^3*[-(a-b)]^5
=-(a-b)^8
(x+y)的三次方乘(-x-y)的四次方乘(-x-y)五次方
=(x+y)^3[-(x+y)]^4[-(x+y)]^5
=-(x+y)^12
1.(2x-1)^2(2x-1)^3+(2x-1)^4[-(2x-1)]
=(2x-1)^5-(2x-1)^5=0
2.x(-x)^2(-x)^2(-x)^3*(-x)^3=x*x^2*x^2(-x^3)(-x^3)
=x^11
3.(-a)^5*a^(2n-3)-a^(2n)(-a)^2
=-a^(2n+2)-a^(2n+2)
=2a^(2n+2)