计算下面各题 能简算的要简算. 4.05-2.8-0.71.25×32×2.5[1-(12-14)]×2399.9×98+(0.8-35)×999.
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计算下面各题,能简算的要简算.
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(1)4.05-2.8-0.7
=1.25-0.7,
=0.55;(2)1.25×32×2.5
=1.25×8×4×2.5,
=(1.25×8)×(4×2.5),
=10×10,
=100;(3)[1-(12-14)]×23
=[1-(24-14)]×23,
=[1-14]×23,
=34×23,
=12;(4)99.9×98+(0.8-35)×999
=999×9.8+(0.8-0.6)×999,
=999×9.8+0.2×999,
=999×(9.8+0.2),
=999×10,
=9990.
