1.
若r > s 沒有的話，分母為0就沒意義
A:r+s
B:((r+s)(r-s))/(r-s) => r+s
A=B
2.
Measurement Frequency
25 4
26 2
27 9
28 3
4+2+9+3=18
18/2=9
median=((9)+(10))/2
A:27
B:26.5
3.
180-z+x+y=180
z=x+y
A:z
B:z
4.
sum of the coordinate => x+y
45度 right triangle => -1+1=0
48 度 =>-1+1.......>0
A
5.
x<y
remainder 3x => x is even 0
x is odd 1
remainder 5y => y is even 0
y is odd 1
if x=even , y=odd => 1
x=odd, y=even => 1
6.
若沒有xy不等於0
假設 x=0和y=0
(2(x^2+y^2)/(1+xy))=x^2+y^2
=>( 2/(1+xy))=1
=>1+xy=2
xy=1
7.
假設 number of dogs 為a
2天 => a*x
7天 =>3a*x+(1/2)a*x=w
a=2w/7x
8.
3x-2k=7
9x-6k=21 =>
k=(3/2)x-(7/2) =>
x=7/3 ~ 0 =>
k=0 ~ -(7/2)
A>B
x>7/3
假設k=8 , x=7.66666
(D)
9.
Profit is equal to the selling price minus the cost
2.1x5000=10500
10500-4500=6000
6000/5000=1.2
10.
w=odd
x=odd
y=even
z=even
(C)
11.
8r/2=24 =>r=6
OS=10
RS=OS-OR=4
12.
13.
2 3 4 6 8 12
1/3
14.
11/2=5.5
medain 6 =>0.15
15.
0.02
0.01
0.02
0.02
0.03
0.02
0.03
0.05
0.03
16.
(0.32-0.05)/0.05=540%
17.
1~6
1~6
4/36=1/9
18.
y^2<1
0<y<1
假設y=-2 y^3=-8
(E)
19.
(65*p+92*n)/(p+n)=86
7p=2n
20.
1 5 10 20
一個
1 5 10 20
兩個
6 11 21 15 25 30
三個
16 26 35 31
四個
36
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