www.qcfz.net > 1.25×0.7+1.25×1.2+12.5怎样简便运算?

1.25×0.7+1.25×1.2+12.5怎样简便运算?

1.25×0.7+1.25×1.2+12.5=1.25x(0.7+1.2+10)=1.25x11.9

1.25×0.7+1.25×1.2+12.5 = 1.25×(0.7+1.2+1) =1.25x2

1.25×3.7+12又1/2×7.83-2又1/2 =1.25×3.7+1.25×78.3-1.

解: (-1.25)除2又1/12 =-1.25÷25/12 =-1.25x12/25 =-0.6

1. 0.4×125×25×0.8 =(0.4×25)×(125×0.8)=10×100=1000

(1)3643-74+6357-76=9850 (2)39×24+39×46+39×30=3900

(1)6.4×1.25×12.5,=8×0.8×1.25×12.5,=(8×1.25)×(0.8×1

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