[問題] GWD-Q-18: #12, #18已刪文
12. During a 10-week summer vacation, was the average (arithmetic mean)
number of books that Carolyn read per week greater than the average number of
books that Jacob read per week?
(1) Twice the average number of books that Carolyn read per week was greater
than 5 less than twice the average number of books that Jacob read per week.
(2) During the last 5 weeks of the vacation, Carolyn read a total of 3 books
more than Jacob.
Ans: A
卡在2C = 2J-5
18. If X^2+Y^2=1, is X+Y=1?
(1) XY=0
(2) Y=0
想問(1) 為什麼不能把 X+Y=1 左右各平方
然後連同題幹，把(1)帶進去把2XY消掉 也可以成立啊?
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◆ From: 140.123.28.28
※ 編輯: heine564 來自: 140.123.28.28 (04/16 18:42)
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