18(x+y)的8次方(x-y)的六次方÷[3(x+y)的3次方(x-y)的3次方]²

问题描述:

18(x+y)的8次方(x-y)的六次方÷[3(x+y)的3次方(x-y)的3次方]²

18(x+y)^8*(x-y)^6÷[9(x+y)^6*(x-y)^6
=2(x+y)^2