已知:(a+b)²=7,(a-b)²=3.求a²+b²和ab的值
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已知:(a+b)²=7,(a-b)²=3.求a²+b²和ab的值
已知:(a+b)²=7,(a-b)²=3.求a²+b²和ab的值
已知:(a+b)²=7,(a-b)²=3.求a²+b²和ab的值
ab=1 a平方加b平方=5