问题 解答题
脱式计算,能简算的要简算
3
7
÷
5
7
×
7
15
7.5×
2
3
+7.5×
1
3
2
7
+
5
7
×
1
5
-
1
14
24÷(
5
9
÷
2
3
)
答案

(1)

3
7
÷
5
7
×
7
15

=

3
7
×
7
5
×
7
15

=

7
25

(2)7.5×

2
3
+7.5×
1
3

=7.5×(

1
3
+
2
3
),

=7.5×1,

=7.5;

(3)

2
7
+
5
7
×
1
5
-
1
14

=

2
7
+
1
7
-
1
14

=

6
14
-
1
14

=

5
14

(4)24÷(

5
9
÷
2
3
),

=24÷(

5
9
×
3
2
),

=24÷

5
6

=24×

6
5

=28.8.

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