①0.65×6.4-6.5×0.54+65×9%
来源:学生作业帮 编辑:拍题作业网作业帮 分类:数学作业 时间:2024/04/27 20:17:37
①0.65×6.4-6.5×0.54+65×9%
②12.5×0.56+1.4÷
②12.5×0.56+1.4÷
2 |
5 |
(1)0.65×6.4-6.5×0.54+65×9%,
=0.65×6.4-0.65×5.4+0.65×9,
=0.65×(6.4-5.4+9),
=0.65×10,
=6.5;
(2)12.5×0.56+1.4÷
2
5,
=7+3.5,
=10.5;
(3)
1
2+
5
6+
11
12+
19
20+
29
30+
41
42+
55
56+
71
72+
89
90,
=
1
2+
1
2+
1
3+
2
3+
1
4+
3
4+
1
5+
4
5+
1
6+
5
6+
1
7+
6
7+
1
8+
7
8+
1
9+
8
9+
1
10,
=1+1+1+1+1+1+1+1+
1
10,
=8
1
10.
=0.65×6.4-0.65×5.4+0.65×9,
=0.65×(6.4-5.4+9),
=0.65×10,
=6.5;
(2)12.5×0.56+1.4÷
2
5,
=7+3.5,
=10.5;
(3)
1
2+
5
6+
11
12+
19
20+
29
30+
41
42+
55
56+
71
72+
89
90,
=
1
2+
1
2+
1
3+
2
3+
1
4+
3
4+
1
5+
4
5+
1
6+
5
6+
1
7+
6
7+
1
8+
7
8+
1
9+
8
9+
1
10,
=1+1+1+1+1+1+1+1+
1
10,
=8
1
10.
①0.65×6.4-6.5×0.54+65×9%
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