奥数题12345X2345+ 2469X38275用简便方法怎么算
3个回答
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(2469*5)*2345+2469*38275
=2469*11725+2469*38275
=2469*(11725+38275)
=2469*50000
=123450000
=2469*11725+2469*38275
=2469*(11725+38275)
=2469*50000
=123450000
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方法一:
12345X2345+ 2469X38275
=(2469X5)X2345+2469X38275
=2469X(5X2345)+2469X(5X7655)
=2469X5X(2345+7655)
=2469X5X10000
=12345X10000
=123450000
方法二:
12345X2345+ 2469X38275
=12345X2345+2469X5X7655
=12345X2345+12345X7655
=12345X(2345+7655)
=12345X10000
=123450000
(此题主要运用了乘法分配律进行简便计算,关键是要把12345分解因数,
得出:12345=2469X5
12345X2345+ 2469X38275
=(2469X5)X2345+2469X38275
=2469X(5X2345)+2469X(5X7655)
=2469X5X(2345+7655)
=2469X5X10000
=12345X10000
=123450000
方法二:
12345X2345+ 2469X38275
=12345X2345+2469X5X7655
=12345X2345+12345X7655
=12345X(2345+7655)
=12345X10000
=123450000
(此题主要运用了乘法分配律进行简便计算,关键是要把12345分解因数,
得出:12345=2469X5
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