Re: [計量] PP2-DS-20.21.168.214
※ 引述《haby (haby)》之銘言:
: 20.If -2x > 3y, is x negative?
: (1) y > 0
: (2) 2x + 5y - 20 = 0
: 答案D 比較困惑第二個答案要怎麼推得呢??
原題 0>2x+3y
(2) 2x+5y=20
但 2x+3y<0
把(2)看成(2x+3y)+2y=20
知y>0 帶回原題 x<0
: 21.Is the integer n odd?
: (1) n is divisible by 3.
: (2) 2n is divisible by twice as many positive integers as n.
: 答案B (不太懂第二個選項的意思)
(2)的意思是說 2n可以整除的正整數是n的兩倍
n=9 則有 1.3.9 則2n就是*6
n=8 1.2.4.8 2n=1.2.4.8.16
這是因為奇數時 因數也會奇樹 乘以2 兩者沒有公因數 所以變成交叉相乘2*3個奇因數
: 168.
: In a certain senior class, 72 percent of the male students and 80 percent of
: the female students have applied to college. What fraction of the students in
: the senior class are male?
: (1) There are 840 students in the senior class.
: (2) 75 percent of the students in the senior class have applied to college.
: 答案B 我選C @@~~
students=f+m
(1) 只知f+m=840 (原題則是說72%的m和80%的f)
(2) 75%(f+m) 有申請學校
75%(f+m)=72%m+80%f
ꔳ3%m=5%f 3m=5f 괠原題要求的是m/f+m 的比例
選b
: 214.
: Is the measure of one of the interior angles of quadrilateral ABCD equal to
: 60 degrees?
: (1) Two of the interior angles of ABCD are right angles.
: (2) The degree measure of angle ABC is twice the degree measure of angle BCD.
: 答案E
: 希望有好心的大牛解答喔^^
(1) 用直角梯型看 不一定
(2) 只知道b是c的兩倍還是不能確定有一角會等於60
選e
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※ 編輯: chengyuyang 來自: 61.31.175.203 (11/20 18:09)
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