若a+b=6.ab=2.则a²+b²=()(a-b)²=()
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若a+b=6.ab=2.则a²+b²=()(a-b)²=()
若a+b=6.ab=2.则a²+b²=()
(a-b)²=()
若a+b=6.ab=2.则a²+b²=()(a-b)²=()
A平方-AB+B平方
=A平方-ab+b平方+3ab-3ab
=(a+b)平方-3ab
=3平方-3
=9-3
=6