题目内容

计算(能简算的要简算).
(15+
5
7
)×
2
15
2
9
-
7
16
×
2
9
13×
3
14
+
3
14
×15
87×
3
86
5
4
×
1
8
×32
7
3
+
2
3
×
6
5
(1)(15+
5
7
)×
2
15

=15×
2
15
+
5
7
×
2
15

=2+
2
21

=2
2
21


(2)
2
9
-
7
16
×
2
9

=
2
9
×
(1-
7
16
),
=
2
9
×
8
16

=
1
9


(3)13×
3
14
+
3
14
×15,
=
3
14
×(13+15),
=
3
14
×
28,
=6;

(4)87×
3
86

=86×
3
86
+1×
3
86

=3+
3
86

=3
3
86


(5)
5
4
×
1
8
×32,
=(
5
4
×
4)×(
1
8
×
8),
=5×1,
=5;

(6)
7
3
+
2
3
×
6
5

=
7
3
+
4
5

=3
2
15
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