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12.5x0.64x2.5简便计算脱式计算

12.5x0.64x2.5 =(12.5x0.8)x(0.4x2.5x2) =10x2 =20

12.5x9.6 =12.5x8x1.2 =100x1.2 =120 -----------------------------------------------------------------------------------------

答案等于2400,有两种演算方法: 1、先依次计算,12.5乘24等于300,300乘8等于2400,之后按简算方法:12.5乘8等于100,100乘24等于2400。 2、用2400除以8等于300,300除以24等于12.5。

4/5x4+2/5x2+1/5x16 =16/5+4/5+16/5 =36/5 =7.2

12.5X(8+0.8) =12.5×8+12.5×0.8 =100+10 =110

12.5x0.56x0.4x0.8x1250 =(12.5×0.8)×(0.4×1250)×0.56 =10×500×0.56 =5000×0.56 =280

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

你好,一定要42+32谢谢

原式 =(12.5x0.8)x(0.5x0.4) =10x0.2 =2

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