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首先可以确定百位数的数值,只能是1,2,3.否则乘以3就要进位变成四位数了。然后根据一定的规律慢慢试,一共试出有4种:
(1)(9)(2)=1/2×(3)(8)(4)=1/3×(5)(7)(6)
(2)(1)(9)=1/2×(4)(3)(8)=1/3×(6)(5)(7)
(2)(7)(3)=1/2×(5)(4)(6)=1/3×(8)(1)(9)
(3)(2)(7)=1/2×(6)(5)(4)=1/3×(9)(8)(1)
(1)(9)(2)=1/2×(3)(8)(4)=1/3×(5)(7)(6)
(2)(1)(9)=1/2×(4)(3)(8)=1/3×(6)(5)(7)
(2)(7)(3)=1/2×(5)(4)(6)=1/3×(8)(1)(9)
(3)(2)(7)=1/2×(6)(5)(4)=1/3×(9)(8)(1)
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