题目内容

计算下列各题.(能简算的要简算)
7
9
-
7
9
÷7=
15÷
8
9
+15×
7
8
=
3
22
÷[
5
4
÷(
14
3
-
1
2
)]
3-
5
18
×
27
40
-
13
16
=
7
9
×9+
7
9
19
13
÷
7
5
-
6
13
×
5
7
=
(1)7÷
7
9
-
7
9
÷7
=7×
9
7
-
7
9
×
1
7

=9-
1
9

=8
8
9


(2)15÷
8
9
+15×
7
8

=15×
9
8
+15×
7
8

=15×(
9
8
+
7
8
),
=15×2,
=30;

(3)
3
22
÷[
5
4
÷(
14
3
-
1
2
)]
=
3
22
÷[
5
4
÷
25
6
],
=
3
22
÷[
5
4
×
6
25
],
=
3
22
÷
3
10

=
3
22
×
10
3

=
5
11


(4)3-
5
18
×
27
40
-
13
16

=3-
3
16
-
13
16

=3-(
3
16
+
13
16
),
=3-1,
=2;

(5)
7
9
×9+
7
9

=7+
7
9

=7
7
9


(6)
19
13
÷
7
5
-
6
13
×
5
7

=
19
13
×
5
7
-
6
13
×
5
7

=(
19
13
-
6
13
)×
5
7

=1×
5
7

=
5
7
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