题目内容

计算下面各题,能简便的要用简便方法计算.
(
1
5
+
2
3
)×15
4-
9
15
÷
9
5
-
2
3
6
5
×
6
7
-
6
7
÷5
7
4
÷(
2
3
+
1
2
)×
4
5

(1)(
1
5
+
2
3
)×15

=
1
5
×15+
2
3
×15

=3+10,
=13;

(2)4-
9
15
÷
9
5
-
2
3

=4-
1
3
-
2
3

=4-(
1
3
+
2
3
),
=4-1,
=3;

(3)
6
5
×
6
7
-
6
7
÷5,
=
6
5
×
6
7
-
6
7
×
1
5

=(
6
5
-
1
5
)×
6
7

=1×
6
7

=
6
7


(4)
7
4
÷(
2
3
+
1
2
)×
4
5

=
7
4
÷
7
6
×
4
5

=
3
2
×
4
5

=
6
5
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