计算下面各题。你认为怎么筒便就怎么箅
来源:学生作业帮 编辑:搜狗做题网作业帮 分类:数学作业 时间:2024/07/01 03:49:24
2.02
![计算下面各题。你认为怎么筒便就怎么箅](/uploads/image/z/18747413-53-3.jpg?t=%E8%AE%A1%E7%AE%97%E4%B8%8B%E9%9D%A2%E5%90%84%E9%A2%98%E3%80%82%E4%BD%A0%E8%AE%A4%E4%B8%BA%E6%80%8E%E4%B9%88%E7%AD%92%E4%BE%BF%E5%B0%B1%E6%80%8E%E4%B9%88%E7%AE%85)
解题思路: (1)可根据加法交换律与结合律计算; (2)(3)可根据减法性质去括号计算; (4)可根据加法交换律与结合律和减法的性质计算.
解题过程:
下面各题怎么计算简便就怎么计算.
6.01-2.9+7.99
29.44-(9.44+0.825)
15.36-(6.3-4.64)
5.9+0.2-5.9-1-0.2.
解:(1)6.01-2.9+7.99,
=6.01+7.99-2.9,
=14-2.9,
=11.1;
(2)29.44-(9.44+0.825),
=29.44-9.44-0.825,
=20-0.825,
=19.175;
(3)15.36-(6.3-4.64),
=15.36+4.64-6.3,
=20-6.3,
=13.7;
(4)5.9+0.2-5.9-1-0.2,
=(5.9-5.6)+(0.2-0.2)-1,
=0+0-1,
=-1.
解题过程:
下面各题怎么计算简便就怎么计算.
6.01-2.9+7.99
29.44-(9.44+0.825)
15.36-(6.3-4.64)
5.9+0.2-5.9-1-0.2.
解:(1)6.01-2.9+7.99,
=6.01+7.99-2.9,
=14-2.9,
=11.1;
(2)29.44-(9.44+0.825),
=29.44-9.44-0.825,
=20-0.825,
=19.175;
(3)15.36-(6.3-4.64),
=15.36+4.64-6.3,
=20-6.3,
=13.7;
(4)5.9+0.2-5.9-1-0.2,
=(5.9-5.6)+(0.2-0.2)-1,
=0+0-1,
=-1.