脱式计算,能简算的一定要简算. 1.25×16 7.6×0.5-0.05 12.8×10.1 8.75×0.25×0.4.
(1)1.25×16 =1.25×8×2, =10×2, =20; (2)7.6×0.5-0.05 =3.8-0.05, =3.75; (3)12.8×10.1 =12.8×(10+0.1), =12.8×10+12.8×0.1, =128+1.28, =129.28. (4)8.75×0.25×0.4 =8.75×(0.25×0.4), =8.75×0.1, =0.875. |
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