题目内容

用递等式计算.
(1)
7
15
÷1
1
5
×2
4
7
-
4
7
÷7
(2)(18.6-18.6÷3.1)×0.01+0.09
(3)[5-1.7÷(1
1
12
-
3
8
)]×1
7
13
(1)
7
15
÷1
1
5
×2
4
7
-
4
7
÷7,
=
7
15
×
5
6
×
18
7
-
4
7
×
1
7

=1-
4
49

=
45
49


(2)(18.6-18.6÷3.1)×0.01+0.09,
=(18.6-6)×0.01+0.09,
=12.6×0.01+0.09,
=0.126+0.09,
=0.216;

(3)[5-1.7÷(1
1
12
-
3
8
)]×1
7
13

=[5-1.7×(
26
24
-
9
24
)]×
20
13

=[5-1.7÷
17
24
20
13

=[5-1.7×
24
17
20
13

=[5-2.4]×
20
13

=2.6×
20
13

=4.
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