用简便方法计算. 7.25-3.42-1.58
答案:1 悬赏:40 手机版
解决时间 2021-03-18 17:46
- 提问者网友:最爱你的唇
- 2021-03-18 04:12
用简便方法计算. 7.25-3.42-1.58
最佳答案
- 五星知识达人网友:酒安江南
- 2021-03-18 05:13
(1)7.25-3.42-1.58,
=7.25-(3.42+1.58),
=7.25-5,
=2.25;
(2)8.27+3.7+0.73+6.3,
=(8.27+0.73)+(3.7+6.3),
=9+10,
=19;
(3)25×23×4,
=(25×4)×23,
=100×23,
=2300;
(4)28×38+72×38,
=(28+72)×38,
=100×38,
=3800.
=7.25-(3.42+1.58),
=7.25-5,
=2.25;
(2)8.27+3.7+0.73+6.3,
=(8.27+0.73)+(3.7+6.3),
=9+10,
=19;
(3)25×23×4,
=(25×4)×23,
=100×23,
=2300;
(4)28×38+72×38,
=(28+72)×38,
=100×38,
=3800.
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