123乘456除789除456乘789除123用简便

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123乘456除789除456乘789除123用简便
123乘456除789除456乘789除123用简便

123乘456除789除456乘789除123用简便
你好!
123×456÷789÷456×789÷123
=123÷123×456÷456×789÷789
=1

只要是除以,就乘以倒数,约分,

用乘法,除法交换律
(123/123)*(456/456)*(789/789)=1