摘要:观察算式: -- 按规律填空:
网址:http://m.1010jiajiao.com/timu3_id_689804[举报]
观察算式:
13=1
13+23=9
13+23+33=36
13+33+33+43=100
…
按规律填空:
13+23+33+43+…+103= .
13+23+33+…+n3= .(n为正整数)
查看习题详情和答案>>
13=1
13+23=9
13+23+33=36
13+33+33+43=100
…
按规律填空:
13+23+33+43+…+103=
13+23+33+…+n3=
观察算式:
=1-
=
+
=1-
+
-
=
+
+
=1-
+
-
+
-
=
(1)按规律填空
+
+
+
+
=
+
+
+
+…+
=
(2)若n为正整数,化简:
+
+
+
+…+
,并写出求解过程.
查看习题详情和答案>>
| 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 |
(1)按规律填空
| 1 |
| 1×2 |
| 1 |
| 2×3 |
| 1 |
| 3×4 |
| 1 |
| 4×5 |
| 1 |
| 5×6 |
| 1 |
| 1×2 |
| 1 |
| 2×3 |
| 1 |
| 3×4 |
| 1 |
| 4×5 |
| 1 |
| 99×100 |
(2)若n为正整数,化简:
| 1 |
| n(n+1) |
| 1 |
| (n+1)(n+2) |
| 1 |
| (n+2)(n+3) |
| 1 |
| (n+3)(n+4) |
| 1 |
| (n+99)(n+100) |