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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 -----------------------------------------------------------------------------------------

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

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。

12.5x2.5x7=87.5x2.5=218.75

简便方法计算如下: (12.5+102.5×7)×2.5×0.4 =[12.5+(90+12.5)x7]x2.5x0.4 =(12.5+90x7+12.5x7)x1 =12.5x(1+7)+90x7 =12.5x8+630 =100+630 =730

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

原式 =(12.5x0.8)x(0.5x0.4) =10x0.2 =2

4x0.8x12.5x2.5 =(4×2.5)×(0.8×12.5) =10×10 =100

12.5x32x0.125 =12.5x(4x8)x0.125 =(12.5x4)x(8x0.125) =50x1 =50 运用乘法结合律。 希望能帮到你!

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