新
If 1+x+x^2+x^3=60, then the average (arithmetic mean) of x, x^2, x^3, and
x^4 is equal to which of the following?
A 12x
B 15x
C 20x
D 30x
E 60x
这个题直接在等式的两边乘以x就好了,然后除以4,答案就是B
新
If 1+x+x^2+x^3=60, then the average (arithmetic mean) of x, x^2, x^3, and
x^4 is equal to which of the following?
A 12x
B 15x
C 20x
D 30x
E 60x
这个题直接在等式的两边乘以x就好了,然后除以4,答案就是B
一 | 二 | 三 | 四 | 五 | 六 | 日 |
---|---|---|---|---|---|---|
31 | 1 | 2 | 3 | 4 | 5 | 6 |
7 | 8 | 9 | 10 | 11 | 12 | 13 |
14 | 15 | 16 | 17 | 18 | 19 | 20 |
21 | 22 | 23 | 24 | 25 | 26 | 27 |
28 | 29 | 30 | 1 | 2 | 3 | 4 |
5 | 6 | 7 | 8 | 9 | 10 | 11 |