2个回答
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(a-b)/(2a+2b)-(a^2+b^2)/(a^2-b^2)
=(a-b)²/没穗喊[2(a-b)(a+b)]-2(a²族带+b²)/[2(a-b)(a+b)]
=-(a+b)²/枯野[2(a-b)(a+b)]
=-(a+b)/[2(a-b)]
=(a-b)²/没穗喊[2(a-b)(a+b)]-2(a²族带+b²)/[2(a-b)(a+b)]
=-(a+b)²/枯野[2(a-b)(a+b)]
=-(a+b)/[2(a-b)]
追问
是乘!!!
追答
a-b/2a+2b *a^2+b^/a^2-b^2
=(a-b)²/[2(a-b)(a+b)]*2(a²+b²)/[2(a-b)(a+b)]
=(a-b)²*2(a²+b²)/[2(a-b)(a+b)]^2
=(a²+b²)/[2(a+b)^2]
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