variation?
回答 (1)
2017-01-12 5:25 pm
✔ 最佳答案
Suppose z = k x³ y²14 = k( 2³ )( 1² ) = 8k
k = 14/8 = 7/4
When x = 3 , y = - 2
z
= k x³ y²
= (7/4) * 3³ * (-2)²
= (7/4) * 27 * 4
= 7 * 27
= 189
Ans: D
收錄日期: 2021-04-18 15:59:33
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20170111141238AApkVog