先化简,再求值,[(a+b)^2/a]-[a-(2ab-b^2)/a],其中a=2011,b=2012

问题描述:

先化简,再求值,[(a+b)^2/a]-[a-(2ab-b^2)/a],其中a=2011,b=2012


[(a+b)²/a-[a-(2ab-b²)/a]
=(a+b)²/a-[(a²-2ab+b²)/a]
=(a²+2ab+b²)/a-(a²-2ab+b²)/a
=(4ab)/a
=4b
=4×2012
=8048