a²+b²=8,a+b=3,ab等于几
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a²+b²=8,a+b=3,ab等于几
a²+b²=8,a+b=3,ab等于几
a²+b²=8,a+b=3,ab等于几
(a+b)²=a²+b²+2ab
所以ab=[(a+b)²-(a²+b²)]/2
=(9-8)/2
=0.5
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