将已知的两式相加,得 a²+b²=17
将已知的两式相减,得 a²+2ab-b²=3
求文档:已知a2+ab=10,b2-ab=7,则a2+b2=________,a2+2ab-b2=________.
求文档:已知a2+ab=10,b2-ab=7,则a2+b2=________,a2+2ab-b2=________.
数学人气:637 ℃时间:2020-03-24 04:23:25
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