问题 解答题
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.
答案

(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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