热度 27
时光の奴: 看。。。。灰机。。。。
p1230512008: 看他的飞机
p1230512008: 不论怎么算,结果都会是9。。。
时光の奴: 师傅,你合起来列前三步的总式算一下试试。。。。
p1230512008: 设所想数为X
(3X+3)×3
=9X+9
=9(X+1)
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