题目内容
计算![]() |
A.-1 B.1 C.0 D.1997 |
试题答案
B
相关题目
计算下列各式的值:
(1)-1+3-5+7-9+11-…-1997+1999;
(2)11+12-13-14+15+16-17-18+…+99+100;
(3)1991×1999-1990×2000;
(4)4726342+472 6352-472 633×472 635-472 634×472 636;
(5)
+
+
+…+
(6)1+4+7+…+244;
(7)1+
+
+
+…+
(8)1
-
+
-
+
-
.
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(1)-1+3-5+7-9+11-…-1997+1999;
(2)11+12-13-14+15+16-17-18+…+99+100;
(3)1991×1999-1990×2000;
(4)4726342+472 6352-472 633×472 635-472 634×472 636;
(5)
| 1 |
| 1×3 |
| 1 |
| 3×5 |
| 1 |
| 5×7 |
| 1 |
| 1997×1999 |
(6)1+4+7+…+244;
(7)1+
| 1 |
| 3 |
| 1 |
| 32 |
| 1 |
| 33 |
| 1 |
| 32000 |
(8)1
| 1 |
| 3 |
| 7 |
| 12 |
| 9 |
| 20 |
| 11 |
| 30 |
| 13 |
| 42 |
| 15 |
| 56 |
计算:
(1)
;
(2)
+
+
+
+
+
+
+
;
(3)
;
(4)
+
+
.
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(1)
| 1999×2000×2001×2002+1 |
(2)
3-2
|
5-2
|
7-2
|
9-2
|
11-2
|
13-2
|
15-2
|
17-2
|
(3)
| ||||||
7+
|
(4)
| ||||||||
(
|
| ||||||||
(
|
| ||||||||
(
|
计算下列各题:
(1)
;
(2)
.
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(1)
| (2×5+2)(4×7+2)…(1994×1997+2) |
| (1×4+2)(3×6+2)…(1993×1996+2) |
(2)
| 20003-2×20002-1998 |
| 20003+20002-2001 |
