题目内容

下面各题,怎样简便就怎样算.
12÷0.4÷
3
4

5
17
÷9+
1
9
×
5
17
4
9
÷[(
5
6
-
1
2
)+(
5
9
-
5
18
)]
24×(
3
8
+
1
6
+
5
12
)
80×
1
8
÷
1
800
×
1
800
1.8×
3
4
+1.2×
3
4
-
3
4
.
(1)12÷0.4÷
3
4
,
=30÷
3
4
,
=40;

(2)
5
17
÷9+
1
9
×
5
17
,
=
5
17
×
1
9
+
1
9
×
5
17
,
=
1
9
×
(
5
17
+
5
17
),
=
1
9
×
10
17
,
=
10
153
;

(3)
4
9
÷[(
5
6
-
1
2
)+(
5
9
-
5
18
)],
=
4
9
÷[
1
3
+
5
18
],
=
4
9
÷
11
18
,
=
8
11
;

(4)24×(
3
8
+
1
6
+
5
12
),
=24×
3
8
+24×
1
6
+24×
5
12
,
=9+4+10,
=23;

(5)80×
1
8
÷
1
800
×
1
800
,
=80×
1
8
×800×
1
800
,
=(80×
1
8
)×(800×
1
800
),
=10×1,
=10;

(6)1.8×
3
4
+1.2×
3
4
-
3
4
,
=(1.8+1.2-1)×
3
4
,
=2×
3
4
,
=
3
2
.
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