问题 解答题
5
9
÷15×
18
5

48×
3
7
+3÷7
7
18
÷(
2
3
-
2
5
)×
4
15

(
3
10
×
5
6
+
3
10
9
4

3
10
×[
7
8
÷(
3
5
-
1
4
)].
答案

5
9
÷15×
18
5

=

5
9
×
1
15
×
18
5

=

2
15

48×

3
7
+3÷7

=48×

3
7
+
3
7

=(48+1)×

3
7

=49×

3
7

=21;

7
18
÷(
2
3
-
2
5
)×
4
15

=

7
18
×
15
4
×
4
15

=

7
18

3
10
×
5
6
+
3
10
÷
9
4

=(

1
4
+
3
10
)×
4
9

=

1
4
×
4
9
+
3
10
×
4
9

=

1
9
+
2
15

=

11
45

3
10
×[
7
8
÷(
3
5
-
1
4
)]

=

3
10
×[
7
8
×
20
7
],

=

3
10
×
5
2

=

3
4

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