题目内容

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)
(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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