问题 解答题
48.9-12.7-0.3=56.4-39.7+24.3=404+26×9=3.5×2.8-4.7=
18.2+38.4÷4.8=
1
4
+
5
8
-
1
2
=
4
3
-
3
4
+
1
6
=
9
13
×
3
8
+
5
8
×
9
13
=
9
4
×
2
3
-
2
3
=
9
16
÷
3
8
+
1
4
1
4
+
1
5
)÷
9
10
-
1
7
=
4
15
+
2
5
×(
5
6
-
2
3
)=
答案

(1)48.9-12.7-0.3,

=48.9-(12.7+0.3),

=48.9-13,

=35.9;

(2)56.4-39.7+24.3,

=16.7+24.3,

=41;

(3)404+26×9,

=404+234,

=638;

(4)3.5×2.8-4.7,

=9.8-4.7,

=5.1;

(5)18.2+38.4÷4.8,

=18.2+8,

=26.2;

(6)

1
4
+
5
8
-
1
2

=

2
8
+
5
8
-
4
8

=

3
8

(7)

4
3
-
3
4
+
1
6

=

16
12
-
9
12
+
2
12

=

3
4

(8)

9
13
×
3
8
+
5
8
×
9
13

=

9
13
×(
3
8
+
5
8
),

=

9
13
×1,

=

9
13

(9)

9
4
×
2
3
-
2
3

=

3
2
-
2
3

=

9
6
-
4
6

=

5
6

(10)

9
16
÷
3
8
+
1
4

=

3
2
+
1
4

=1

3
4

(11)(

1
4
+
1
5
)÷
9
10
-
1
7

=

9
20
×
10
9
-
1
7

=

1
2
-
1
7

=

5
14

(12)

4
15
+
2
5
×(
5
6
-
2
3
),

=

4
15
+
2
5
×
1
6

=

4
15
+
1
15

=

1
3

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