摘要: 按规律填空:-2.4.-8.16. .-.
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观察算式:
=1-
=
,
+
=1-
+
-
=
+
+
=1-
+
-
+
-
=
按规律填空
+
+
+
=
+
+
+
+…+
=
;
如果n为正整数,那么
+
+
+
+…+
=
.
由此拓展写出具体过程,
+
+
+…+
=.
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| 1 |
| 1×2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 1×2 |
| 1 |
| 2×3 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 1×2 |
| 1 |
| 2×3 |
| 1 |
| 3×4 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 3 |
| 4 |
按规律填空
| 1 |
| 1×2 |
| 1 |
| 2×3 |
| 1 |
| 3×4 |
| 1 |
| 4×5 |
| 4 |
| 5 |
| 4 |
| 5 |
| 1 |
| 1×2 |
| 1 |
| 2×3 |
| 1 |
| 3×4 |
| 1 |
| 4×5 |
| 1 |
| 99×100 |
| 99 |
| 100 |
| 99 |
| 100 |
如果n为正整数,那么
| 1 |
| 1×2 |
| 1 |
| 2×3 |
| 1 |
| 3×4 |
| 1 |
| 4×5 |
| 1 |
| n×(n+1) |
| n |
| n+1 |
| n |
| n+1 |
由此拓展写出具体过程,
| 1 |
| 1×3 |
| 1 |
| 3×5 |
| 1 |
| 5×7 |
| 1 |
| 99×101 |
观察下面三行数.并按规律填空:
①2,-4,8,-16,
②-1,2,-4,8,
③3,-3,9,-15,
(1)第①行数按什么规律排列?
(2)第②③行数与第①行数分别有什么关系?
(3)取每行数的第10个数,计算这三个数的和.
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①2,-4,8,-16,
32
32
,-64
-64
,…;②-1,2,-4,8,
-16
-16
,32
32
,…;③3,-3,9,-15,
33
33
,-63
-63
,…;(1)第①行数按什么规律排列?
(2)第②③行数与第①行数分别有什么关系?
(3)取每行数的第10个数,计算这三个数的和.