发布网友 发布时间:2024-10-21 14:43
共3个回答
热心网友 时间:2024-11-07 06:07
原式=(a-b)²/(a+b)(a-b)÷(b-a)/ab
=(a-b)/(a+b)×[-ab/(a-b)]
=-ab/(a+b)
=-(2-1)/(2√2)
=-√2/4
热心网友 时间:2024-11-07 06:05
:(a2-2ab+b2)/(a2-b2)/(1/a-1/b),
=(a-b)^2÷(a-b)(a+b)÷[(b-a)/(ab)]
=-ab/(a+b)
热心网友 时间:2024-11-07 06:01
(a2-2ab+b2)/(a2-b2)/(1/a-1/b)
=(a-b)²/(a-b)(a+b) /[(b-a)/ab]
=(a-b)/(a+b) *ab/(b-a)
=-ab/(a+b)
=-1/(√2+1+√2-1)
=-1/2√2
=-√2/4