下面各题,能用简算的要用简便计算.
1.85×2.5+2.15×2.5
81.99÷0.9×0.17
18.26-2.35-4.65
1.25×32×0.25
31.6÷1.25÷8
4.2÷0.7÷6
21.63-13.8×0.15
6.3÷3.5.
下面各题,能用简算的要用简便计算.1.85×2.5+2.15×2.581.99÷0.9×0.1718.26-2.35-4.651.25×32×0.2531.6÷1.2
答案:2 悬赏:40 手机版
解决时间 2021-03-23 11:10
- 提问者网友:人傍凄凉立暮秋
- 2021-03-23 05:52
最佳答案
- 五星知识达人网友:鱼忧
- 2021-03-23 06:49
解:(1)1.85×2.5+2.15×2.5
=(1.85+2.15)×2.5,
=4×2.5,
=10;
(2)81.99÷0.9×0.17
=91.1×0.17,
=15.487;
(3)18.26-2.35-4.65
=18.26-(2.35+4.65),
=18.26-7,
=11.26;
(4)1.25×32×0.25
=(1.25×8)×(4×0.25),
=10×1,
=10;
(5)31.6÷1.25÷8
=31.6÷(1.25×8),
=31.6÷10,
=3.16;
(6)4.2÷0.7÷6
=4.2÷(0.7×6),
=4.2÷4.2,
=1;
(7)21.63-13.8×0.15
=21.63-2.07,
=19.56;
(8)6.3÷3.5
=6.3÷0.7÷5,
=9÷5,
=1.8.解析分析:本题据四则混合运算法则计算即可,同时要认真分析式中数据,尽量用简便方法计算.点评:完成此类有关于小数的四则混合运算题目要注意小数点位置的变化.
=(1.85+2.15)×2.5,
=4×2.5,
=10;
(2)81.99÷0.9×0.17
=91.1×0.17,
=15.487;
(3)18.26-2.35-4.65
=18.26-(2.35+4.65),
=18.26-7,
=11.26;
(4)1.25×32×0.25
=(1.25×8)×(4×0.25),
=10×1,
=10;
(5)31.6÷1.25÷8
=31.6÷(1.25×8),
=31.6÷10,
=3.16;
(6)4.2÷0.7÷6
=4.2÷(0.7×6),
=4.2÷4.2,
=1;
(7)21.63-13.8×0.15
=21.63-2.07,
=19.56;
(8)6.3÷3.5
=6.3÷0.7÷5,
=9÷5,
=1.8.解析分析:本题据四则混合运算法则计算即可,同时要认真分析式中数据,尽量用简便方法计算.点评:完成此类有关于小数的四则混合运算题目要注意小数点位置的变化.
全部回答
- 1楼网友:举杯邀酒敬孤独
- 2021-03-23 08:15
正好我需要
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