题目内容

下面各题,怎样筒便就怎样算.
18÷(4.49+34.3×0.2)
8
13
÷7+
1
7
×
5
13
11
10
-
1
4
-
3
4
+
9
10
1
2
×3.2+5.6×0.5+1.2×50%
(9-3.06÷
3
5
)×
20
13
[1-(
5
3
-1.5)÷
5
12
]×0.75.
(1)18÷(4.49+34.3×0.2)
=18÷(4.49+6.86)
=18÷11.35
=1
133
227


(2)
8
13
÷7+
1
7
×
5
13

=
8
13
×
1
7
+
1
7
×
5
13

=(
8
13
+
5
13
)×
1
7

=1×
1
7

=
1
7


(3)
11
10
-
1
4
-
3
4
+
9
10

=(
11
10
+
9
10
)-(
1
4
+
3
4

=2-1
=1;

(4)
1
2
×3.2+5.6×0.5+1.2×50%
=0.5×3.2+5.6×0.5+1.2×0.5
=(3.2+5.6+1.2)×0.5
=10×0.5
=5;

(5)(9-3.06÷
3
5
)×
20
13

=(9-5.1)×
20
13

=3.9×
20
13

=6;

(6)[1-(
5
3
-1.5)÷
5
12
]×0.75
=[1-
1
6
÷
5
12
]×0.75
=[1-
2
5
]×0.75
=
3
5
×0.75
=
9
20
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