69乘以73分之72加上71乘以73分之74如何算过程?
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69×72/73+71×74/73
=69×72/73+71×(72/73+2/73)
=69×72/73+71×72/73+71×2/73
=(69+71)×72/73+71×2/73
=140×72/73+142/73
=72×140/73+140/73+2/73
=(72+1)×140/73+2/73
=73×140/73+2/73
=140+2/73
=140又2/73
=69×72/73+71×(72/73+2/73)
=69×72/73+71×72/73+71×2/73
=(69+71)×72/73+71×2/73
=140×72/73+142/73
=72×140/73+140/73+2/73
=(72+1)×140/73+2/73
=73×140/73+2/73
=140+2/73
=140又2/73
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