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variation3
2012-09-15 10:28 pm
回答 (1)
2012-09-16 8:16 pm
✔ 最佳答案
1 (p + q) = K(p - q)p - Kp = -q - Kq
(1 - K)p = -(K + 1)q
p ∝ q
2 c(a + 2) = K
Sub. a = -1, c = 2 => K = 2
So, when a =2, c = 2/(2 + 2) = 1/2
3 p = K + A√x
Sub. p(1) = -1 and p(4) = -4
-1 = K + A, -4 = K + 2A
A = -3, K = 2
p(9) = 2 + 3 * (-3) = -7
4 The answer is A as it is joint variation
收錄日期: 2021-04-27 17:45:23
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20120915000051KK00273