05#46
(sin^2)1+(sin^2)3+(sin^2)5+......+(sin^2)87+(sin^2)89=
A. 22 B. 22.5 C. 44.5 D. 45
can anyone give me a full explanation?
04#54
The mean deviation of the four numbers x - 8, x - 2, x + 3 and x + 7 is
A. x . B. 0 C. 5 D. 5.6
Maths Pastpeper MC Q
2007-05-06 10:03 pm
回答 (1)
2007-05-06 11:10 pm
✔ 最佳答案
mean deviation out syl(sin^2)1+(sin^2)3+(sin^2)5+......+(sin^2)87+(sin^2)89=
(sin^2)89 = (cos^2)1
(sin^2)1 + (cos^2)1 = 1 ----- (a)
一路計就會計到22個好似(a) 既野
淨低1個 (sin^2)45
(sin^2)45 = 0.5
ans = 22.5 = b
收錄日期: 2021-04-13 00:27:29
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