题目
题型:解答题难度:一般来源:不详
1 |
(a-1)(b+1) |
1 |
(a-2)(b+2) |
1 |
(a-2000)(b+2000) |
答案
∴ab+2=0,且a+1=0,
∴a=-1,b=2.
∴原式=
1 |
-2×3 |
1 |
-3×4 |
1 |
-2001×2002 |
=-(
1 |
2×3 |
1 |
3×4 |
1 |
2001×2002 |
=-(
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
2001 |
1 |
2002 |
=-
1 |
2 |
1 |
2002 |
500 |
1001 |
核心考点
举一反三
a |
|a| |
b |
|b| |
c |
|c| |