问题 解答题
2-0.5×0.4
4
5
-
13
20
+
7
10
3
7
÷6×
7
2
+
1
2
2
3
+
1
5
÷
13
5
×
3
4
3
10
+(
4
7
+
1
2
7
25
[
1
2
-(
3
4
-
3
5
)
]÷
7
10
答案

(1)2-0.5×0.4,

=2-0.2,

=1.8;

(2)

4
5
-
13
20
+
7
10

=

3
20
+
7
10

=

17
20

(3)

3
7
÷6×
7
2
+
1
2

=

1
14
×
7
2
+
1
2

=

1
4
+
1
2

=

3
4

(4)

2
3
+
1
5
÷
13
5
×
3
4

=

2
3
+
1
13
×
3
4

=

2
3
+
3
52

=

113
156

(5)

3
10
+(
4
7
+
1
2
)×
7
25

=

3
10
+
15
14
×
7
25

=

3
10
+
3
10

=

3
5

(6)[

1
2
-(
3
4
-
3
5
)]÷
7
10

=[

1
2
-
3
20
]÷
7
10

=

7
20
÷
7
10

=

1
2

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