用喜欢的方法计算下面各题.6.2×2.1-2.1 5.12+2.54+4.88 12.5×17.8×0.8 9.9×2.5 9.4×5.8+10
答案:1 悬赏:30 手机版
解决时间 2021-02-18 17:06
- 提问者网友:爱了却不能说
- 2021-02-17 18:05
用喜欢的方法计算下面各题.6.2×2.1-2.1 5.12+2.54+4.88 12.5×17.8×0.8 9.9×2.5 9.4×5.8+10
最佳答案
- 五星知识达人网友:往事埋风中
- 2021-02-17 19:19
(1)6.2×2.1-2.1,
=(6.2-1)×2.1,
=5.2×2.1,
=10.92;
(2)5.12+2.54+4.88,
=5.12+4.88+2.54,
=10+2.54,
=12.54;
(3)12.5×17.8×0.8,
=12.5×0.8×17.8,
=10×17.8,
=178;
(4)9.9×2.5,
=(10-0.1)×2.5,
=10×2.5-0.1×2.5,
=25-0.25,
=24.75;
(5)9.4×5.8+10.6×5.8,
=(9.4+10.6)×5.8,
=20×5.8,
=116;
(6)12.5×0.4×2.5×8,
=(12.5×8)×(0.4×2.5),
=100×1,
=100.
=(6.2-1)×2.1,
=5.2×2.1,
=10.92;
(2)5.12+2.54+4.88,
=5.12+4.88+2.54,
=10+2.54,
=12.54;
(3)12.5×17.8×0.8,
=12.5×0.8×17.8,
=10×17.8,
=178;
(4)9.9×2.5,
=(10-0.1)×2.5,
=10×2.5-0.1×2.5,
=25-0.25,
=24.75;
(5)9.4×5.8+10.6×5.8,
=(9.4+10.6)×5.8,
=20×5.8,
=116;
(6)12.5×0.4×2.5×8,
=(12.5×8)×(0.4×2.5),
=100×1,
=100.
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