a(a-2)-(a平方-2b)=-8 求(a平方+b平方/2)-ab
a(a-2)-(a平方-2b)=-8 求(a平方+b平方/2)-ab
数学人气:634 ℃时间:2020-03-12 09:58:04
优质解答
解a(a-2)-(a²-2b)=-8即a²-2a-a²+2b=-8∴a-b=4两边平方a²+b²-2ab=16∴a²+b²=16+2ab[(a²+b²)/2]-ab=[(16+2ab)/2]-ab=8+ab-ab=8
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