1.
P1=3/4
P2=[1-1/9]P1=2/3
P3=[1-1/16]P2=5/8
P4=[1-1/25]p3=3/5
P5=[1-1/36]p4=7/12
2.
(x+1)^5(y+1)^4(z+1)^3<0
z>0
(y+1)^4>0
X<-1
3.
(1+49)*25/2=625
(2+50)*25/2=650
5.
At 8:00 =>5000
A =>2:00 6 40000 2^3*5000
B =>(1.5)^6*5000=56953.125
6.
X<y-4
X和Y間距是4
設y=10 x<6 x=5 4 3 2 1
10 5
A:6 8
B:7 9
10 1
A:2 4 6 8 10
B:1 3 5 7 9
設 y=11 x<7 6 5 4 3 2 1
A: 6 8 10
B:7 9 11
X+4<y
Y X
654321
7654321
當X=1 y=6 7 8 9 ………..
7.
OD=OQ
8.
180=A+B+C
A+C=90
B=90
9.
1 2 3 4 5
A =>4!
5*4!
10.
Original price =>x
Already-reduced price =>a
0.5a=0.6x
a=1.2x
分母比分子大 => x/a
5/6=
11.
6 0
0 8
12.
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9
3,3(X) 3,6(X) 3,9(X)
6,3 6,6(X) 6,9(X)
9,3 9,6 9,9(X)
C9取2 =>36
3/36 1/12
13.
(S^2)-(A/2)
14.
9.5=>16.04
7.2=>12.16
15.
28=>14men
39400-14000=25400
16.
(48.5/40)*5200=6305
17.
-2<x-2<2
0<x<4
18.
6 7 8 9 10 11 12 13 14
10 => 100-50+1=51
19.
4 2
4 =>500
1 =>125
100/125=0.8
200/125=1.6
400/125=3.2
500/125=4
700/125=5.6
800/125=6.4
20.
The area of the campus =>x
(2/3)*(1/8)=1/12
8/12-1/12=7/12
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