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计算下面各题,能简算的要用简便方法算.0.75+1.25×2.4 5.67×0.21-0.62 3...

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解决时间 2021-01-21 00:33
  • 提问者网友:心如荒岛囚我终老
  • 2021-01-20 10:46
计算下面各题,能简算的要用简便方法算.0.75+1.25×2.4 5.67×0.21-0.62 3...
最佳答案
  • 五星知识达人网友:封刀令
  • 2021-01-20 12:03
(1)0.75+1.25×2.4
=0.75+(1.25×8)×0.3
=0.75+10×0.3
=0.75+3
=3.75;

(2)5.67×0.21-0.62
=1.1907-0.62
=0.5707;

(3)3.8×6.7+3.3×3.8
=3.8×(6.7+3.3)
=3.8×10
=38;

(4)1.28×0.29-0.29×0.28
=0.29×(1.28-0.28)
=0.29×1
=0.29;

(5)101×4.8
=(100+1)×4.8
=100×4.8+4.8
=480+4.8
=484.8;
    
(6)4.89×99+4.89
=4.89×(99+1)
=4.89×100
=489.
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