【(1/3a^m+1)^2×b^n+3-(3a^m+1)^3(-ab^n+1)^2】÷(-1/3a^mb^n)^-2
问题描述:
【(1/3a^m+1)^2×b^n+3-(3a^m+1)^3(-ab^n+1)^2】÷(-1/3a^mb^n)^-2
答
原式=[1/9×a^(2m+2)×b^(n+3)-27a^(m+1)×a^2b^(2n+2)]×(-1/3a^mb^n)^2
=[1/9×a^(2m+2)×b^(n+3)-27a^(m+3)×b^(2n+2)]×(1/9a^2mb^2n)
=1/9×a^(2m+2)×b^(n+3)×(1/9a^2mb^2n)-27a^(m+3)×b^(2n+2)×(1/9a^2mb^2n)
=1/81×a^(2m+2+2m)×b^(n+3+2n)-3×a^(m+3+2m)×b^(2n+2+2n)
=1/81×a^(4m+2)×b^(3n+3)-3×a^(3m+3)×b^(4n+2)