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1.25乘0.4x8x2.5简算

8x1.25+0.4x2.5

125X0.4X8X2.5 =125X8X0.4X2.5 =1000x1 =1000

0.4x1.25x8x2.5 =(0.4×2.5)×(1.25×8) =1×10 =10

0.4x0.8x1.255x2.5 = (0.4x2.5)x(0.8x1.25+0.8×0.005) = 1 x(1+0.004) = 1 x 1.004 = 1.004

例10.简便计算:(1)1.25×2.5×32 (2)600÷2.5...64÷(8X2)1000÷(125X4) 第十四种375X(109-9)...4、先乘前两个数,或者先乘后两个数,积不变,这...

12.5x0.76x0.4×8x2.5 = (12.5x8)x0.76x(0.4x2.5) = 10x0.76x1 = 7.6

12.6×0.76×0.4×8×2.5 =12.6×0.76×8×(0.4×2.5) =12.6×0.76×8 =12.6×8×0.76 =100.8×0.76 =100×0.76+0.8×0.76 =76.608 9.8÷0.25+0.2×4 =9.8×4+0.2×4 =(9.8+0.2)×4 =10×4 =40 111×3.6-0.2×4 =111×9×0.4-0.8 =999×0.4-0.8 =(1000-1)×0.4-0.8 =1000×0....

0.4x+7.5=15 x=(15-7.5)/0.4 =7.5/0.4 =18.75 8x-12=52 x=(52+12)/8 =64/8 =8

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