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123×456÷789÷456×789÷123 的简便算法

乘除法交换率: 456×123×789÷456÷789÷123 =456÷456×123÷123×789÷789 =1

123×456÷789÷456×789÷123=(123÷123)× (456÷456)×(789÷789)=1x1x1=1

123×456÷123÷456 =123÷123×456÷456 (乘除法的交换律) =(123÷123)×(456÷456) (乘除法的结合律) =1×1 =1

123×456÷789÷456×789÷123,=(123÷123)×(456÷456)×(789÷789),=1×1×1,=1;故答案为:1.

12.3÷78.9×456÷123×0.789÷45.6的简便算法 12.3÷78.9×456÷123×0.789÷45.6 =(12.3÷123)*(78.9÷0.789)*(456÷45.6) =0.1*100*10 =100

123×234÷123×345÷456÷234×456 =(123 ÷ 123)x(234 ÷ 234)x(456 ÷ 456)x345 =1x1x1x345 =345

解:原式=123÷2+456/789x1/2 =123/2+228/789 =61+1/2+3+105/789 =64+789/1578+210/1578 =64+999/1578 =64又999/1578

(123/123)x(456/456)=1

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