题目内容

脱式计算,注意使用简便算法.
5
18
÷(
5
6
+
5
9
)
5
7
+
2
7
×(
3
10
+
2
5
)
(
1
4
-
1
20
)×40
4
9
÷
3
8
4
7
+9×
3
7
+9
15
22
÷[
1
4
÷(
1
2
-
1
3
)]
(1)
5
18
÷(
5
6
+
5
9

=
5
18
÷
25
18

=
1
5


(2)
5
7
+
2
7
×(
3
10
+
2
5

=
5
7
+
2
7
×
7
10

=
5
7
+
1
5

=
32
35


(3)(
1
4
-
1
20
)×40
=
1
4
×40-
1
20
×40
=10-2
=8;

(4)3×
4
9
÷
3
8

=
4
3
÷
3
8

=
32
9


(5)9×
4
7
+9×
3
7
+9
=9×(
4
7
+
3
7
+1)
=9×2
=18;

(6)
15
22
÷[
1
4
÷(
1
2
-
1
3
)]
=
15
22
÷[
1
4
÷
1
6
]
=
15
22
÷
3
2

=
5
11
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