[計量] 請問CAT 14問題
1. Twenty students share equally the cost of a present for their teacher.
If 4 of the students decide not to contribute, each of the other students
will have to pay $1.50 more. How much does the present cost, in dollars?
Ans : 120
令有X學生 一人付Y元
=> 4Y = (X-4)*3/2 和 XY = (X-4)(Y+3/2)
這是我列出的條件 不過其實這兩個條件相等 =.=
2. 有(0,0)和(1,3)兩點 請問斜率?
根據斜率算法 = (3-0)/(1-0) = 3 可是我記得斜率的範圍不是介於-1和1 ??
麻煩幫忙解答一下
感謝
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