题目内容

计算下面各题,能简算的要简算
2
15
÷
7
10
-
1
7

7
8
÷
8
9
-
3
8
×
9
8

5
9
+
13
18
)×18
7
9
-
7
9
÷7.
(1)
2
15
÷
7
10
-
1
7

=
2
15
×
10
7
-
1
7

=
4
21
-
3
21

=
1
21


(2)
7
8
÷
8
9
-
3
8
×
9
8

=
7
8
×
9
8
-
3
8
×
9
8

=(
7
8
-
3
8
)×
9
8

=
1
2
×
9
8

=
9
16


(3)(
5
9
+
13
18
)×18
=
5
9
×18+
13
18
×18,
=10+13,
=23;

(4)7÷
7
9
-
7
9
÷7,
=7×
9
7
-
7
9
×
1
7

=9-
1
9

=8
8
9
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