(1)200-199+198-197+196 …+2-1
(2)2012×20132013-2013×20122012
(3)1.25×98+12
1
2
×
1
10
+1
1
4

(4)
1
2007
+
2
2007
+
3
2007
+…+
2006
2007

(5)0.35÷0.125÷64÷0.5÷0.25
(6)
1
2
+
5
6
-
7
12
+
9
20
-
11
30
+
13
42
-
15
56
分析:(1)兩個(gè)1組,分組計(jì)算即可;
(2)將2012×20132013-2013×20122012變形為2012×2013×10001-2013×2012×10001,即可求解;
(3)根據(jù)乘法分配律簡(jiǎn)便計(jì)算;
(4)根據(jù)同分母分?jǐn)?shù)的計(jì)算法則和高斯求和公式計(jì)算;
(5)先化為分?jǐn)?shù),除法變?yōu)槌朔,再約分計(jì)算即可;
(6)先拆分,再抵消法計(jì)算即可求解.
解答:解:(1)200-199+198-197+196 …+2-1,
=(200-199)+(198-197)+(196 …+(2-1),
=1×100,
=100;

(2)2012×20132013-2013×20122012,
=2012×2013×10001-2013×2012×10001,
=0;

(3)1.25×98+12
1
2
×
1
10
+1
1
4
,
=1.25×98+1.25+1.25,
=1.25×(98+1+1),
=1.25×100,
=125;

(4)
1
2007
+
2
2007
+
3
2007
+…+
2006
2007

=
1+2+…+2006
2007
,
=
(1+2006)×2006÷2
2007
,
=1003;

(5)0.35÷0.125÷64÷0.5÷0.25,
=
7
20
×8×
1
64
×2×4,
=
7
20
;

(6)
1
2
+
5
6
-
7
12
+
9
20
-
11
30
+
13
42
-
15
56

=1-
1
2
+
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-
1
8
,
=
7
8
點(diǎn)評(píng):考查了四則混合運(yùn)算中的巧算,注意靈活運(yùn)用運(yùn)算律簡(jiǎn)便計(jì)算.
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