风中星雨
幼苗
共回答了13个问题采纳率:92.3% 举报
[(a^2+b^2)/(a^2-b^2)-(a-b)/(a+b)]/[2ab/(a-b)(a+b)^2]
=[(a^2+b^2)/(a-b)(a+b)-(a-b)^2/(a-b)(a+b)]/[2ab/(a-b)(a+b)^2]
=[(a^2+b^2-a^2+2ab-b^2)/(a-b)(a+b)]/[2ab/(a-b)(a+b)^2]
=[2ab/(a-b)(a+b)]/[2ab/(a-b)(a+b)^2]
=(a-b)(a+b)^2/(a-b)(a+b)
=a+
1年前
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