题目内容

计算
(1)1.3×
1
4
-
1
2
×0.25+0.2÷4
(2)[(1
1
3
-
8
15
)
×75%+
1
4
17
20

(3)[14.8+(6
2
7
-4.5)×1
3
25
2
2
3

(4)
1
2
+
1
6
+
1
12
+
1
20
+
1
30
+
1
42
(1)1.3×
1
4
-
1
2
×0.25+0.2÷4,
=1.3×
1
4
-0.5×
1
4
+0.2×
1
4

=(1.3-0.5+0.2)×
1
4

=1×
1
4

=
1
4


(2)[(1
1
3
-
8
15
)
×75%+
1
4
17
20

=[(
4
3
-
8
15
)×
3
4
+
1
4
17
20

=[
4
5
×
3
4
+
1
4
17
20

=[
3
5
+
1
4
]÷
17
20

=
17
20
÷
17
20

=1;

(3)[14.8+(6
2
7
-4.5)×1
3
25
2
2
3

=[14.8+(
44
7
-
9
2
)×
28
25
2
2
3

=[14.8+
25
14
×
28
25
2
2
3

=[14.8+2]÷2
2
3

=16
4
5
÷2
2
3

=
84
5
×
3
8

=
63
10


(4)
1
2
+
1
6
+
1
12
+
1
20
+
1
30
+
1
42

=(1-
1
2
)+(
1
2
-
1
3
)+(
1
3
-
1
4
)+(
1
4
-
1
5
)+(
1
5
-
1
6
)+(
1
6
-
1
7
),
=1-
1
2
+
1
2
-
1
3
+
1
3
-
1
4
+
1
4
-
1
5
+
1
5
-
1
6
+
1
6
-
1
7

=1-
1
7

=
6
7
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