题目内容
观察下列各式的计算结果
1-
=1-
═
=
×
1-
=1-
═
=
×
1-
=1-
═
=
×
1-
=1-
═
=
×
(1)用你发现的规律填写下列式子的结果:
1-
═ × ;
1-
= × ;
1-
= × ;
(2)用你发现的规律计算:(1-
)×(1-
)×(1-
)×…×(1-
)
1-
| 1 |
| 22 |
| 1 |
| 4 |
| 3 |
| 4 |
| 1 |
| 2 |
| 3 |
| 2 |
1-
| 1 |
| 32 |
| 1 |
| 9 |
| 8 |
| 9 |
| 2 |
| 3 |
| 4 |
| 3 |
1-
| 1 |
| 42 |
| 1 |
| 16 |
| 15 |
| 16 |
| 3 |
| 4 |
| 5 |
| 4 |
1-
| 1 |
| 52 |
| 1 |
| 25 |
| 24 |
| 25 |
| 4 |
| 5 |
| 6 |
| 5 |
(1)用你发现的规律填写下列式子的结果:
1-
| 1 |
| 102 |
1-
| 1 |
| 1002 |
1-
| 1 |
| 20122 |
(2)用你发现的规律计算:(1-
| 1 |
| 22 |
| 1 |
| 32 |
| 1 |
| 42 |
| 1 |
| 20112 |
考点:有理数的混合运算
专题:规律型
分析:(1)根据题意总结出一般性规律,得出所求式子结果即可;
(2)利用得出的规律将原式变形,计算即可得到结果.
(2)利用得出的规律将原式变形,计算即可得到结果.
解答:解:(1)根据题意得:1-
=
×
;
1-
=
×
;
1-
=
×
;
(2)根据题意得:原式=
×
×
×
×…×
×
=
.
故答案为:(1)根据题意得:
×
;
×
;
×
;
| 1 |
| 102 |
| 9 |
| 10 |
| 11 |
| 10 |
1-
| 1 |
| 1002 |
| 99 |
| 100 |
| 101 |
| 100 |
1-
| 1 |
| 20122 |
| 2011 |
| 2012 |
| 2013 |
| 2012 |
(2)根据题意得:原式=
| 1 |
| 2 |
| 3 |
| 2 |
| 2 |
| 3 |
| 4 |
| 3 |
| 2010 |
| 2011 |
| 2012 |
| 2011 |
| 1006 |
| 2011 |
故答案为:(1)根据题意得:
| 9 |
| 10 |
| 11 |
| 10 |
| 99 |
| 100 |
| 101 |
| 100 |
| 2011 |
| 2012 |
| 2013 |
| 2012 |
点评:此题考查了有理数的混合运算,熟练掌握运算法则是解本题的关键.
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