a+b=5,a的平方+B的平方=13,化简并求b乘以根号b分之a+a乘以根号a分之b
人气:169 ℃ 时间:2020-01-29 02:20:49
解答
a+b=5,a的平方+B的平方=13
ab=[(a+b)²-(a²+b²)]/2
=(25-13)/2
=6
b乘以根号b分之a+a乘以根号a分之b
=根号ab+根号ab
=2根号ab
=2根号6
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