1.
(m+n)/2=15 =>m+n=30, m>=15 , n<=15或m>=15 , n>=15。
A:(30+15)/3=15
B:median15
A=B
2.
Value of X 1 2 3 4 5
Frequency 10 20 10 40 20
(1x10+2x20+3x10+4x40+5x20)/100=3.4
A:3.4
B:3
A>B
3.
A:7x11x13=1001
B:750
A>B
4.
AB線段=b
AC線段=a
BC=sqrt(a^2+b^2)
A:a^2+b^2
B:a^2+b^2
A=B
5.
0<x^7<1
A:sqrt(x)
B:x
x為分數或小數點
假設A=B , x^2=x
x=1, 不在範圍內,
所以答案C不可能
x^(1/2)<x
但是x小數點
所以A>B
6.
n is a prime number
-4<n-50<4 =>
46<n<54
A:47, 53
B:52
答案是D
7.
44% completed work on Tuesday
56% uncompleted work on Tuesday
0.56 x 0.25=14% completed
56%-14%=42%
A=B
8.
S consist of (x,y)
x is less than 50
y=(1/2)x+10
x=1 3 5 7 9
11 13 15 17 19
21 23 25 27 29
31 33 35 37 39
41 43 45 47 49
A=B=25
9.
monthly phone bill 60.75
=>monthly phone charges + sales tax
設 x為monthly phone charges
1.08x=60.75
x=56.25
10.
x^2+x-12=0 , x<=0
(x-3)(x+4)=0
x=3 , -4
11.
72 fish => 24 brown , 48 white
72 fish => 36 orange fins , 36 black fins
48 white fish =>32 orange fins
24 brown fish => 4 orange fins 20 black fins
12.
13.
(a)
profit equals sales price minus cost
profit x dollars
merchant 4x dollars
x/5x=20%
(b)
a-4x=x
=>a=5x
20%
14.
tenured faculty members => 610
210+230+250=690
nontenured =>2200-610=1590
690/1590=43.39%
15.
(A)7%
(B)10%
(C)10%
(D)18.6%
(E)9.1%
16.
12.5%+8%+7%+15%=42.5%
(42.5/100)x360=153度
17.
(x+y)/2=0
=> y=-x 或 x+y=0
(A) x=1 和 y=-1
(B) x=0 和 y=0
(C) y=-x
(D) y和x一定一正一負 不然就是零
有可能y正 , x也正
18.
19.
perimeter of rectangular 140t+10
length 40t
width 30t+5
305~365
20.
(1/y)=x^3 => y=1/x^3
(1/w)=y^3 => w=1/y^3
w=x^9
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