题目内容

计算下面各题,能用简便算法的就用简便算法
4
9
×
15
16
÷
5
6
9
20
÷6+
1
20
×
1
6
5.58-
7
30
÷
14
25
-
7
12
5÷[(
2
3
+
1
5
3
13
]

(1)
4
9
×
15
16
÷
5
6

=
5
12
÷
5
6

=
1
2


(2)
9
20
÷6+
1
20
×
1
6

=
9
20
×
1
6
+
1
20
×
1
6

=(
9
20
+
1
20
1
6

=
1
2
×
1
6

=
1
12


(3)5.58-
7
30
÷
14
25
-
7
12

=5.58-
5
12
-
7
12

=5.58-(
5
12
+
7
12
),
=5.58-1,
=4.58;

(4)5÷[(
2
3
+
1
5
3
13
]

=5÷[
13
15
×
3
13
],
=5÷
1
5

=25.
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