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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

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。

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

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

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

12.5x0.4x0.25x0.8用脱式计算 =(12.5x0.8)x(0.4x0.25) =10x0.1 =1

你好,一定要42+32谢谢

=0.4x2.5x(0.8x0.25)

12.5x4.4x0.25 =12.5x(1.1x4)x0.25 =12.5x1.1x(4x0.25) =12.5x1.1x1 =13.75 另外,你上面那题写错了 1.25x2.5x32 =1.25x(8x4)x2.5 =(1.25x8)x(4x2.5) =10x10 =100

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