摘要:观察下列等式:--------------可以推测.当≥2()时. .解:由观察可知当.每一个式子的第三项的系数是成等差数列的.所以.第四项均为零.所以.
网址:http://m.1010jiajiao.com/timu_id_78247[举报]
观察下列等式:
+2=4;
×2=4;
+3=
;
×3=
;
+4=
;
×4=
;…,根据这些等式反映的结果,可以得出一个关于自然数n的等式,这个等式可以表示为 .
查看习题详情和答案>>
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 2 |
| 9 |
| 2 |
| 3 |
| 2 |
| 9 |
| 2 |
| 4 |
| 3 |
| 16 |
| 3 |
| 4 |
| 3 |
| 16 |
| 3 |
观察下列等式:
×
=1-
×
+
×
=1-
×
+
×
+
×
=1-
…
由以上各式推测第4个等式为
×
+
×
+
×
+
×
=1-
×
+
×
+
×
+
×
=1-
.
查看习题详情和答案>>
| 3 |
| 1×2 |
| 1 |
| 2 |
| 1 |
| 22 |
| 3 |
| 1×2 |
| 1 |
| 2 |
| 4 |
| 2×3 |
| 1 |
| 22 |
| 1 |
| 3×22 |
| 3 |
| 1×2 |
| 1 |
| 2 |
| 4 |
| 2×3 |
| 1 |
| 22 |
| 5 |
| 3×4 |
| 1 |
| 23 |
| 1 |
| 4×23 |
…
由以上各式推测第4个等式为
| 3 |
| 1×2 |
| 1 |
| 2 |
| 4 |
| 2×3 |
| 1 |
| 22 |
| 5 |
| 3×4 |
| 1 |
| 23 |
| 6 |
| 4×5 |
| 1 |
| 24 |
| 1 |
| 5×24 |
| 3 |
| 1×2 |
| 1 |
| 2 |
| 4 |
| 2×3 |
| 1 |
| 22 |
| 5 |
| 3×4 |
| 1 |
| 23 |
| 6 |
| 4×5 |
| 1 |
| 24 |
| 1 |
| 5×24 |