题目内容

能简算的要简算
8
9
+
1
9
×15
5
12
-
5
18
)×36
7
15
×
8
9
×
5
21
7
18
-
4
5
×
7
18
5
7
×
2
3
+
5
7
×
1
3
39×
23
38
5
14
×
9
11
+
13
14
×
5
11

(1)
8
9
+
1
9
×15,
=
8
9
+
5
3

=
23
9


(2)(
5
12
-
5
18
)×36,
=
5
12
×36-
5
18
×36,
=15-10,
=5;

(3)
7
15
×
8
9
×
5
21

=
7
15
×
5
21
×
8
9

=
1
9
×
8
9

=
8
81


(4)
7
18
-
4
5
×
7
18

=
7
18
×(1-
4
5
),
=
7
18
×
1
5

=
7
90


(5)
5
7
×
2
3
+
5
7
×
1
3

=
5
7
×(
2
3
+
1
3
),
=
5
7


(6)39×
23
38

=(38+1)×
23
38

=38×
23
38
+1×
23
38

=23+
23
38

=23
23
38


(7)
5
14
×
9
11
+
13
14
×
5
11

=
5
14
×
9
11
+
5
14
×
13
11

=
5
14
×(
9
11
+
13
11
),
=
5
14
×2,
=
5
7
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