问题 解答题
1
30
+
1
35
+
1
63
)×2
1
7

37-0.37×8.28-3.7×0.172
(2
1
4
-1
3
5
)×1.6÷(1.82×
1
7

[6-(
1
12
+
1
15
)×30]÷(1
1
4
×0.9)
[0.75-(2
1
3
-1
1
9
)÷4]÷[(1
1
2
+2
2
3
)÷2
1
2
-
5
6
].
答案

(1)(

1
30
+
1
35
+
1
63
)×2
1
7

=

1
30
×
15
7
+
1
35
×
15
7
+
1
63
×
15
7

=

1
2
×
1
7
+
3
7
×
1
7
+
5
21
×
1
7

=(

1
2
+
3
7
+
5
21
)×
1
7

=(

21
42
+
18
42
+
10
42
)×
1
7

=

49
42
×
1
7

=

1
6

(2)37-0.37×8.28-3.7×0.172,

=3.7×10-3.7×0.828-3.7×0.172,

=(10-0.828-0.172)×3.7,

=[10-(0.828+0.172)]×3.7,

=[10-1]×3.7,

=10×3.7-3.7,

=37-3.7,

=33.3;

(3)(2

1
4
-1
3
5
)×1.6÷(1.82×
1
7
),

=(

45
20
-
32
20
)×
8
5
÷
13
5

=

13
20
×
8
5
×
5
13

=

2
5

(4)[6-(

1
12
+
1
15
)×30]÷(1
1
4
×0.9),

=[6-(

5
60
+
4
60
)×30]÷(
5
4
×
9
10
),

=[6-

9
60
×30]÷
9
8

=[6-

9
2
8
9

=

3
2
×
8
9

=

4
3

(5)[0.75-(2

1
3
-1
1
9
)÷4]÷[(1
1
2
+2
2
3
)÷2
1
2
-
5
6
],

=[

3
4
-(2
3
9
-1
1
9
)×
1
4
]÷[(1
3
6
+2
4
6
)÷
5
2
-
5
6
],

═[

3
4
-
11
9
×
1
4
]÷[
25
6
×
2
5
-
5
6
],

=[

27
36
-
11
36
]÷[
10
6
-
5
6
],

=

4
9
÷
5
6

=

4
9
×
6
5

=

8
15

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