[問題] 數學題
請教各位大大三個數學題
(一)
Q
╱╲
╱ z ╲
╱ ╲
╱x y╲
P—————————R
圖大概畫了一下 Q的角度是Z度 P的角度是X度 R的角度是Y度
請問 PQ>PR ??
(1)X=Y
(2)Y=Z
ANS:(B)
我想不透的是如果Y=Z的話 那不就是一個等腰三角型 且PQ=PR了
為何PQ還會大於PR呢
(二)In a certain store, item X sells for 10 percent less than item Y. What is
the ratio of the store's revenue from the sales of item X to that from
the sales of item Y ?
(1)The store sells 20 percent more units of item Y than item X
(2)The store's revenue from the sales of item X is $6,000 and from the sales
of item Y is $8,000.
ANS:(D)
(三)Solution Y is 30 percent liquid X and 70 percent water. If 2 kilograms of
water evaporate from 8 kilograms of solution Y and 2 kilograms of solution
Y are added to the remaining 6 kilograms of liquid, what percent of this
new solution is liquid X ?
(A)30% (B)33.3% (C)37.5% (D)40% (E)50%
ANS:(C)
以上這三題 請教各位了 最後一題的題目看的不是很懂 XD
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