问题 解答题
脱式计算
(1)(6
1
2
-3
1
4
)÷(13+11
1
5
) 
(2)
1
6
+
1
12
+
1
30
+
1
42
+
1
56

(3)2.25×
3
5
+2.75÷1
2
3
+60%

(4)(1+3+5+…+1001)-(2+4+6+…+1000)
答案

(1)(6

1
2
-3
1
4
)÷(13+11
1
5
),

=(6

1
2
-3
1
4
)÷24
1
5

=3

1
4
÷
121
5

=

13
4
×
5
121

=

65
484

(2)

1
6
+
1
12
+
1
30
+
1
42
+
1
56

=

1
2
-
1
3
+
1
3
-
1
4
+
1
4
-
1
5
+
1
5
-
1
6
+
1
6
-
1
7
+
1
7
-
1
8

=

1
2
-
1
8

=

3
8

(3)2.25×

3
5
+2.75÷1
2
3
+60%,

=2.25×

3
5
+2.75×
3
5
+1×
3
5

=(2.25+2.75+1)×

3
5

=6×

3
5

=3

3
5

(4)(1+3+5+…+1001)-(2+4+6+…+1000),

=1+(3-2)+(5-4)+…+(1001-1000),

=1+1+1+…+1,

=501.

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