问题 解答题
4
7
-
4
21
+
1
3
)×42
0.42×1
3
7
+3
1
8
1
7
12
÷3.6×
6
19
15
1
3
×7+3
2
3
÷
1
7
3
2
13
-
1
4
×3.6
3
4
×1
1
9
÷3
2
5
答案

(1)(

4
7
-
4
21
+
1
3
)×42,

=

4
7
×42-
4
21
×42+
1
3
×42,

=24-8+12,

=16+12,

=28;

(2)0.42×1

3
7
+3
1
8

=0.6+3

1
8

=3.725;

(3)1

7
12
÷3.6×
6
19

=1

7
12
×
5
18
×
6
19

=

5
36

(4)15

1
3
×7+3
2
3
÷
1
7

=15

1
3
×7+3
2
3
×7,

=(15

1
3
+3
2
3
)×7,

=19×7,

=133;

(5)3

2
13
-
1
4
×3.6,

=3

2
13
-0.9,

=

293
130

(6)

3
4
×1
1
9
÷3
2
5

=

3
4
×
10
9
×
5
17

=

25
102

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