(a+b+c)²
=a²+b²+c²+2(ab+bc+ca)
=111+58
=169
所以a+b+c=-13或13
己知:a的平方+b的平方+c的平方=111,ab+bc+ca=29,则a+b+c=?
己知:a的平方+b的平方+c的平方=111,ab+bc+ca=29,则a+b+c=?
数学人气：113 ℃时间：2019-08-19 19:48:25
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