问题 解答题
脱式计算,能简算的要简算.
(
1
3
+
1
12
-
1
6
)×24
4
5
×
2
3
+
1
5
÷
3
4
2
7
×
8
9
+
5
7
×
8
9
5
7
+
5
8
)×
2
5
答案

(1)(

1
3
+
1
12
-
1
6
)×24

=

1
3
×24+
1
12
×24-
1
6
×24

=8+2-4

=6;

(2)

4
5
×
2
3
+
1
5
÷
3
4

=

4
5
×
2
3
+
1
5
×
4
3

=

4
5
×(
2
3
+
1
3

=

4
5

(3)

2
7
×
8
9
+
5
7
×
8
9

=(

2
7
+
5
7
)×
8
9

=1×

8
9

=

8
9

(4)(

5
7
+
5
8
)×
2
5

=

5
7
×
2
5
+
5
8
×
2
5

=

2
7
+
1
4

=

15
28

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