Re: [計量] 幾題數學
※ 引述《assoe (讓我變聰明吧!!!)》之銘言：
: 請教幾題數學
: 比大小
: 1. A number whose square 15
: is 4 less than twice the
: square of 10
: ans:(B)
: 看不太懂題目的表達方式@@"
一個數字，其平方比兩倍的10的平方小4
: 2. It the average (arithmetic mean) of x, y, z, 5,
: and 7 is 8, which of the
: value for x = 1?
: I The median of the five numbers cannot be 5
: II At least one of x, y and z is greater than 9
: III The range of the five numbers is 2 or more
: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
: 不知道這個敘述為什麼正確
不曉得range的意思是不是數字間的差? ?
: (A) I only
: (B) II only
: (C) III only
: (D) I and III
: (E) II and III
: ans:(E)
: 3. A circular flower bed lies in a square garden
: plot that is 60 meters on each side. What
: fraction of the garden plot area is not part
: of the flower bed?
: (A) 1/4
: (B) 3/4
: (C) (4-π)/2
: (D) (4-π)/4
: (E) (π-2)/4
: ans:(D)
: 完全不知道這題該怎麼下手@@"
: 請高手指教
: 感謝!!
flower bed = 30*30*pi
garden plot = 60*60
answer = (garden plot-flower bed)/garden plot
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※ 編輯: eadanlin 來自: 140.113.92.6 (05/28 12:12)
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