问题 解答题
用你喜欢的方法计算.
5
9
×
3
5
×
5
8

1
2
÷
2
15
×
1
5

2
7
×
2
5
+
3
5
×
2
7

11-
3
11
-
7
11
-
1
11
答案

(1)

5
9
×
3
5
×
5
8

=

1
3
×
5
8

=

5
24

(2)

1
2
÷
2
15
×
1
5

=

15
4
×
1
5

=

3
4

(3)

2
7
×
2
5
+
3
5
×
2
7

=

2
7
×(
2
5
+
3
5
),

=

2
7
×1,

=

2
7

(4)11-

3
11
-
7
11
-
1
11

=11-(

3
11
+
7
11
+
1
11
),

=11-1,

=10.

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