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0.25x1.38x4用脱式计算该怎么算?

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

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

0.75x4➗0.75x4用脱式计 =(0.75÷0.75)×(4×4) =1×16 =16

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

250x17x4 =250x4x17 =1000x17 =17000

168÷4+20×4 =42+80 =112

0.125x0.25x8x4 =(0.125x8)x(0.25x4) =1x1 =1

128÷16+12x4 =128/4/4+48 =32/4+48 =8+48=56

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

如图

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