计算(-3a^3)乘(-2a^2)=________________ 计算:1/(a+b)+2b/(a^2-b^2)

问题描述:

计算(-3a^3)乘(-2a^2)=________________ 计算:1/(a+b)+2b/(a^2-b^2)

(-3a^3)乘(-2a^2)=6a^51/(a+b)+2b/(a^2-b^2)=1/(a+b)+2b/[(a+b)(a-b)]
=(a-b+2b)/[(a+b)(a-b)]
=(a+b)/[(a+b)(a-b)]
=1/(a-b)