问题 解答题
用你喜欢的方法计算.
3
4
×
5
4
÷
15
4

5
6
+
11
12
)÷
11
12

5
8
-
1
3
×
9
8

5
7
×21+
2
7
÷
1
21
答案

(1)

3
4
×
5
4
÷
15
4

=

3
4
×
5
4
×
4
15

=

1
4

(2)(

5
6
+
11
12
)÷
11
12

=(

5
6
+
11
12
)×
12
11

=

5
6
×
12
11
+
11
12
×
12
11

=

10
11
+1,

=1

10
11

(3)

5
8
-
1
3
×
9
8

=

5
8
-
3
8

=

1
4

(4)

5
7
×21+
2
7
÷
1
21

=(

5
7
+
2
7
)×21,

=1×21,

=21.

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