124乘以123分之31

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124乘以123分之31
124乘以123分之31

124乘以123分之31
124=123+1
124 * 31 /123 = (123+1) * 31 / 123
= 31 + 31/123
= 31又123分之31

124×31/123
=(123+1)×31/123
=123×31/123+31/123
=31+31/123
=31又123分之31

(123+1)×31/123
=31+31/123
=31又31/123

可以把124分成123和1,分别于31/123相乘
124 * 31/123=(123+1) * 31/123
=123 * 31/123+31/123
=31+31/123
=31又123分之31

(123+1)*31/123
=123*31/123+31/123
=31又31/123