题目内容

简便计算
(1)4.85-
5
9
+5.15-
4
9

(2)
1
9
×(4
3
4
÷
5
18
-3.6+6.15×3
3
5
)

(3)
3
4
÷[(
4
5
+
1
4
3
7
]

(4)1
1
6
+3
1
12
+5
1
20
+7
1
30
+9
1
42
(1)4.85-
5
9
+5.15-
4
9

=4.85+5.15-(
5
9
+
4
9
),
=10-1,
=9;

(2)
1
9
×(4
3
4
÷
5
18
-3.6+6.15×3
3
5
)

=
1
9
×
(4.75×
18
5
-3.6+6.15×3.6),
=
1
9
×
[(4.75+6.15-1)×3.6],
=
1
9
×
9.9×3.6,
=3.96;

(3)
3
4
÷[(
4
5
+
1
4
3
7
]

=
3
4
÷
[
21
20
×
3
7
],
=
3
4
÷
9
20

=
3
4
×
20
9

=1
2
3


(4)1
1
6
+3
1
12
+5
1
20
+7
1
30
+9
1
42

=(1+3+5+7+9)+(
1
6
+
1
12
)+(
1
20
+
1
30
+
1
42

=25+(
2
12
+
1
12
)+(
3
60
+
2
60
+
1
42

=25+
3
12
+
5
60
+
1
42

=25+(
3
12
+
1
12
+
1
42

=25+
1
3
+
1
42

=25+(
14
42
+
1
42
),
=25
15
42

=25
5
14
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