问题
解答题
请观察下列算式,找出规律并填空.
(1)则第10个算式是______=______, (2)第n个算式为:______=______. (3)根据以上规律解答下题: 若有理数a,b满足a=1,b=3,试求
|
答案
(1)
1 |
10×11 |
1 |
10 |
1 |
11 |
(2)
1 |
n×(n+1) |
1 |
n |
1 |
n+1 |
(3)
1 |
ab |
1 |
(a+2)(b+2) |
1 |
(a+4)(b+4) |
1 |
(a+100)(b+100) |
=
1 |
1×3 |
1 |
(1+2)×(3+2) |
1 |
(1+4)×(3+4) |
1 |
(1+100)×(3+100) |
=
1 |
1×3 |
1 |
3×5 |
1 |
5×7 |
1 |
101×103 |
=
1 |
2 |
1 |
3 |
1 |
3 |
1 |
5 |
1 |
5 |
1 |
7 |
1 |
101 |
1 |
103 |
=
1 |
2 |
1 |
103 |
=
1 |
2 |
102 |
103 |
=
51 |
103 |
故答案为:
1 |
10×11 |
1 |
10 |
1 |
11 |
1 |
n×(n+1) |
1 |
n |
1 |
n+1 |