用簡便方法計算下麵個題，並驗算.580÷20 760÷60 1000÷300

用簡便方法計算下麵個題，並驗算.580÷20 760÷60 1000÷300


580÷20 =58/2=29
760/60=76/6=38/3
1000/300=10/3



計算下麵各題，並驗算2/3-1/2= 5/6×4/7= 3.85*4.2= 3182/37=
是分開的


2/3-1/2
=4/6-3/6
=1/6
5/6×4/7
=5/3×2/7
=10/21
3.85*4.2
=16.17
3182/37
=86



計算下麵各題，並用中法交換律驗算.38+456 307+348 123+2847


4946552970

Elden Ring Premiere

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