(a-b)/(2a+2b)-(a平方+b平方)/(a平方-b平方)
=1/2*(a-b)/(a+b)-(a^2+b^2)/[(a+b)(a-b)]
=[(a-b)^2-2(a^2+b^2)]/[2(a+b)(a-b)]
=-[a^2+b^2+2ab]/[2(a+b)(a-b)]
=-1/2*(a+b)/(a-b)
(a-b)/(2a+2b)-(a平方+b平方)/(a平方-b平方)计算
(a-b)/(2a+2b)-(a平方+b平方)/(a平方-b平方)计算
其他人气:690 ℃时间:2019-10-01 09:34:46
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