问题 解答题
脱式计算
①14
3
17
-6.46-3.54
②4.2÷1.5-1.5×0.6③(4
5
6
-3
3
4
)÷(
4
13
+
2
7
④51.6÷[(3
2
5
-1.25)×
4
5
].
答案

①14

3
17
-6.46-3.54,

=14

3
17
-(6.46+3.54),
=14
3
17
-10,

=4

3
17

②4.2÷1.5-1.5×0.6,

=2.8-0.9,

=1.9;

③(4

5
6
-3
3
4
)÷(
4
13
+
2
7
),

=(4

10
12
-3
9
12
)÷(
28
91
+
26
91
),

=

13
12
÷
54
91

=

13
12
×
91
54

=

1183
648

④51.6÷[(3

2
5
-1.25)×
4
5
],

=51.6÷[

17
5
×
4
5
-
5
4
×
4
5
],

=51.6÷[

68
25
-1],

=51.6÷

43
25

=51.6×

25
43

=30.

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