(a^2+b^2)2-ab+2
=(a^2+b^2-2ab)/2+2
=(a-b)^2/2+2
=2^2/2+2
=2+2
=4
若a-b=2 ,求2分之a的平方+b的平方-ab+2的值
若a-b=2 ,求2分之a的平方+b的平方-ab+2的值
数学人气：517 ℃时间：2020-03-04 09:28:51
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