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250x17x4用脱式计算怎么算

250x17x4 =250x4x17 =1000x17 =17000

解:原式=508-120×4-3×4 =508-480-12 =28-12 =16

17.8x(1.78x4)脱式计算简便 17.8×(1.78×4) =17.8×7.12 =126.736.

=25*4*17 =100*17 =1700

75x4x25x4 =(75x4)x(25x4) =300x100 =30000

25x11x4 =25x4x11 =100x(10+1) =100x10+100x1 =1000+100 =1100

2.5x45x0.4 =2.5x0.4x45 =1x45 =45

5.73x4.27+5.73x5.73 =5.73x(4.27+5.73) =5.73x10 =57.3

1602*16 诸如此类 其实根本不用脱式计算 你只要将前面的因数每个位数与后面的因数相乘就行了 我就这么做的 很爽

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