((2a+2b)分之(a-b))-((a方-b方)分之(a方+b方)))
=(a-b)/[2*(a+b)] -(a^2+b^2)/[(a+b)(a-b)]
通分,得:
=[(a-b)(a-b)-2*(a^2+b^2)]/[2*(a+b)(a-b)]
=[-(a+b)^2]/[2*(a+b)(a-b)]
=-(a+b)/2(a-b)
希望我的回答让你满意
((2a+2b)分之(a-b))-((a方-b方)分之(a方+b方)))
=(a-b)/[2*(a+b)] -(a^2+b^2)/[(a+b)(a-b)]
通分,得:
=[(a-b)(a-b)-2*(a^2+b^2)]/[2*(a+b)(a-b)]
=[-(a+b)^2]/[2*(a+b)(a-b)]
=-(a+b)/2(a-b)
希望我的回答让你满意