题目内容

计算下面各题,能用简便方法算的要用简便方法算
7
13
×
5
6
+
5
6
÷
13
6

4
15
×[(
3
4
-
2
5
)÷
15
4
]
7
8
-
4
5
+
3
8
×
1
3

25×1.25×4×8.
(1)
7
13
×
5
6
+
5
6
÷
13
6

=
7
13
×
5
6
+
5
6
×
6
13

=(
7
13
+
6
13
)×
5
6

=1×
5
6

=
5
6


(2)
4
15
×[(
3
4
-
2
5
)÷
15
4
],
=
4
15
×[(
15
20
-
8
20
)×
4
15
],
=
4
15
×
[
7
20
×
4
15
],
=
4
15
×
7
75

=
28
1125


(3)
7
8
-
4
5
+
3
8
×
1
3

=
7
8
-
4
5
+
1
8

=
7
8
+
1
8
-
4
5

=1-
4
5

=
1
5


(4)25×1.25×4×8,
=(25×4)×(1.25×8),
=100×10,
=1000.
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