10640÷560=504900÷4900=213×105=49×215=

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10640÷560
=10640÷（80×7）
=10640÷80÷7
=19，
?504900÷4900=103…200
????????????????????1 0 3
????????4900
????????????? 4 9?0 0
??????????? _________________
??????????????? 1 4 9 0 0
??????????????? 1 4 7 0 0
?????????? _________________
??????????????????? 2 0 0


213×105=22365
?????? ?? 2 1 3
×1 0 5
__________________
?????? ?1 0 6 5
??? ? 2 1 3
___________________
????? 2 2 3 6 5

49×215=10535
????????? 4 9
×2 1 5
__________________
??????? 2 4 5
??????? 4 9
????? 9 8
_________________
??? 1 0 5 3 5
解析分析：根据乘、除法的计算法则计算．

点评：乘除法中难度较大并且容易出错的题．