一个两位数,十位数与个位数之和为9,且这两个数字之积等于他们两个数字和的2倍,求这两位数
人气：490 ℃ 时间：2019-08-31 09:32:35
解答
设十位数为X
X*(9-X）=9*2
X²-9X+18=0
(x-6)(x-3)=0
x1=6 x2=3
两位数=36或63
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