已知a²-ab=50,ab-b²=30,求代数式a²-b²和a²-2ab+b²的值
人气：119 ℃ 时间：2019-10-29 09:10:01
解答
a²-ab=50,ab-b²=30,
a²-b²
=a²-ab+ab-b²
=50+30
=80
a²-2ab+b²
=a²-ab-ab+b²
=a²-ab-(ab-b²)
=50-30
=20
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