题目内容

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
].

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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