a^2-4b^2/a^2+2ab+b^2`a^2+ab/a+2b怎么做?
问题描述:
a^2-4b^2/a^2+2ab+b^2`a^2+ab/a+2b怎么做?
答
=(a+2b)(a-2b)/(a+b)²×a(a+b)/(a+2b)
=a(a-2b)/(a+b)
=(a²-2ab)/(a+b)