下面各题怎样算简便就怎样算
88.51-9.06-0.94?????????????????132+16.4+268+23.63.028-20.44+66.972??????????????55.27+8.236-5.2764.6-3.46+5.4-6.54???????????64.3-18.75+15.7-11.25.
下面各题怎样算简便就怎样算88.51-9.06-0.94?????????????????132+16.4+268+23.63.028-20.44+66.972???
答案:2 悬赏:50 手机版
解决时间 2021-12-20 01:16
- 提问者网友:伴风望海
- 2021-12-19 13:21
最佳答案
- 五星知识达人网友:刀戟声无边
- 2021-12-19 14:44
解:(1)88.51-9.06-0.94,
=88.51-(9.06+0.94),
=88.51-10,
=78.51;
(2)132+16.4+268+23.6,
=(132+268)+(16.4+23.6),
=400+40,
=440;
(3)3.028-20.44+66.972,
=(3.028+66.972)-20.44,
=70-20.44,
=49.56;
(4)55.27+8.236-5.27,
=(55.27-5.27)+8.236,
=50+8.236,
=52.236;
(5)64.6-3.46+5.4-6.54,
=(64.6+5.4)-(3.46+6.54),
=70-10,
=60;
(6)64.3-18.75+15.7-11.25,
=(64.3+15.7)-(18.75+11.25),
=80-30,
=50.解析分析:(1)根据连续减去两个数等于减去这两个数的和简算;
(2)运用加法结合律简算;
(3)运用加法交换律简算;
(4)运用加法交换律简算;
(5)运用加法结合律简算以及连续减去两个数等于减去这两个数的和简算;
(6)运用加法结合律简算以及连续减去两个数等于减去这两个数的和简算.点评:此题是考查小数的加减混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
=88.51-(9.06+0.94),
=88.51-10,
=78.51;
(2)132+16.4+268+23.6,
=(132+268)+(16.4+23.6),
=400+40,
=440;
(3)3.028-20.44+66.972,
=(3.028+66.972)-20.44,
=70-20.44,
=49.56;
(4)55.27+8.236-5.27,
=(55.27-5.27)+8.236,
=50+8.236,
=52.236;
(5)64.6-3.46+5.4-6.54,
=(64.6+5.4)-(3.46+6.54),
=70-10,
=60;
(6)64.3-18.75+15.7-11.25,
=(64.3+15.7)-(18.75+11.25),
=80-30,
=50.解析分析:(1)根据连续减去两个数等于减去这两个数的和简算;
(2)运用加法结合律简算;
(3)运用加法交换律简算;
(4)运用加法交换律简算;
(5)运用加法结合律简算以及连续减去两个数等于减去这两个数的和简算;
(6)运用加法结合律简算以及连续减去两个数等于减去这两个数的和简算.点评:此题是考查小数的加减混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
全部回答
- 1楼网友:毛毛
- 2021-12-19 16:22
我也是这个答案
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