题目内容

计算,怎样简便怎样算
7
9
÷
11
5
+
2
9
×
5
11
12
15
×(
5
6
+
3
4
)+
4
5
7
18
×
1
4
+
3
4
÷
18
7
4
5
-
4
5
÷4.
(1)
7
9
÷
11
5
+
2
9
×
5
11

=
7
9
×
5
11
+
2
9
×
5
11

=(
7
9
+
2
9
)×
5
11

=
5
11

(2)
12
15
×(
5
6
+
3
4
)+
4
5

=
12
15
×
5
6
+
12
15
×
3
4
+
4
5

=
2
3
+
3
5
+
4
5

=
2
3
+
7
5

=2
1
15

(3)
7
18
×
1
4
+
3
4
÷
18
7

=
7
18
×
1
4
+
3
4
×
7
18

=(
1
4
+
3
4
)×
7
18

=
7
18

(4)4÷
4
5
-
4
5
÷
4,
=4×
5
4
-
4
5
×
1
4

=5-
1
5

=4
1
5
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