用简便方法计算下面各题.3.8×6.7+3.3×3.81.28×0.29-0.29×0.28101×4.8 ...
答案:1 悬赏:30 手机版
解决时间 2021-11-11 15:26
- 提问者网友:喧嚣尘世
- 2021-11-11 06:59
用简便方法计算下面各题.3.8×6.7+3.3×3.81.28×0.29-0.29×0.28101×4.8 ...
最佳答案
- 五星知识达人网友:走死在岁月里
- 2021-11-11 08:28
(1)3.8×6.7+3.3×3.8
=(6.7+3.3)×3.8
=10×3.8
=38;
(2)1.28×0.29-0.29×0.28
=(1.28-0.28)×0.29
=1×0.29
=0.29;
(3)101×4.8
=(100+1)×4.8
=100×4.8+1×4.8
=480+4.8
=484.8.
(4)56×12.5×2
=7×(8×12.5)×2
=7×100×2
=1400.
=(6.7+3.3)×3.8
=10×3.8
=38;
(2)1.28×0.29-0.29×0.28
=(1.28-0.28)×0.29
=1×0.29
=0.29;
(3)101×4.8
=(100+1)×4.8
=100×4.8+1×4.8
=480+4.8
=484.8.
(4)56×12.5×2
=7×(8×12.5)×2
=7×100×2
=1400.
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