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12.5×6.4怎样简便运算

12.5*6.4 =12.5*8*0.8 =100*0.8 =80

1.25 ×( 0.8×8 ) =1.25×8×0.8 =10×0.8 =8

6.4×1.25×12.5 =8×1.25×0.8×12.5 =10×10 =100

6.4x12.5x25 =8x0.8x12.5x25 =(8x12.5)x(0.8x25) =100x20 =2000

0.25×12.5×6.4 简便计算 我秒采纳 0.25×12.5×6.4 =(0.25*8)*(12.5*8) =2*100 =200

12.5×6.4-0.25×2.4 =12.5×0.8×8-0.25×4×0.6 =10×8-1×0.6 =80-0.6 =79.4

题目出错了,貌似应该这样的: 12.8×72×7.5÷6.4 =(12.8÷6.4)×9×(8×7.5) =2×9×60 =1080

12.5×6.4-0.25×2.4 =12.5×8×0.8+0.25×4×0.6 =100×0.8+1×0.6 =80+0.6 =80.6

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