用简便方法计算.
8-4.9-5.1
6.75-(0.9+3.75)34+1.8+3.66+0.20.96-0.28+0.04-0.72.
用简便方法计算.8-4.9-5.16.75-(0.9+3.75)34+1.8+3.66+0.20.96-0.28+0.04-0.72.
答案:2 悬赏:40 手机版
解决时间 2021-12-20 05:24
- 提问者网友:浩歌待明月
- 2021-12-19 04:30
最佳答案
- 五星知识达人网友:轻雾山林
- 2021-12-19 05:04
解:(1)8-4.9-5.1,
=8-(4.9+5.1),
=8-10,
=-2;
(2)6.75-(0.9+3.75),
=6.75-0.9-3.75,
=6.75-3.75-0.9,
=3-0.9,
=2.1;
(3)34+1.8+3.66+0.2,
=34+3.66+(1.8+0.2),
=34+3.66+2,
=39.66;
(4)0.96-0.28+0.04-0.72,
=(0.96+0.04)-(0.28+0.72),
=1-1,
=0.解析分析:(1)根据从一个数里连续减去两个数等于减去两个数的和计算;(2)去括号,先算6.75-3.75;(3)把1.8和0.2先结合计算;(4)把0.96和0.04结合,0.28和0.72结合,再计算.点评:此题是考查加减混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
=8-(4.9+5.1),
=8-10,
=-2;
(2)6.75-(0.9+3.75),
=6.75-0.9-3.75,
=6.75-3.75-0.9,
=3-0.9,
=2.1;
(3)34+1.8+3.66+0.2,
=34+3.66+(1.8+0.2),
=34+3.66+2,
=39.66;
(4)0.96-0.28+0.04-0.72,
=(0.96+0.04)-(0.28+0.72),
=1-1,
=0.解析分析:(1)根据从一个数里连续减去两个数等于减去两个数的和计算;(2)去括号,先算6.75-3.75;(3)把1.8和0.2先结合计算;(4)把0.96和0.04结合,0.28和0.72结合,再计算.点评:此题是考查加减混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
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- 1楼网友:街头电车
- 2021-12-19 06:09
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