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1.
A:180-z
B:z
Z 55 125
140 40
2.
3/2=3/2
3.
X+y=6
4.
B:49-11=38
11 49
5.
A:a
B:w=a+1 ,(1+a+3a)/4=a+1/4
6.
A:(x+3)^2/(x^2-9)
B:(x-3)^2/(x^2-9)
X=1
A:-2
B:-1/2
X=-4
A:1/7
B:-7
7.
Sqrt((4-k)^2+9)
Sqrt((4-k)^2+9)
8.
sqrt(3)/2
9.
(4*600+2*900)=4200
13200-4200=9000
9000/6=1500
10.
(t+2100)*d/t
11.
8 4sqrt(3) 4
12.
+30-30=0
1~10 11~20
Median a
Change =>a-2
13.
8x+12y=280
X=y
20y=280
Y=14
8*14/280=2/5
14.
59-36=23 =>S
59-35=24 =>D
52+47=99
49+46=95
15.
4+2+1+3+7=17
17/5=3.4
16.
36~47
47~43
43~59
11-4+16=23
23/36=63.9%
17.
X<=2
Y<=2
Z<=2
X>=-3
Y>=-3
z>=-3
x=-3
y=-3
z=2
18
18.
r-t>0
t-r<0
19.
3x+5y=120
X+y=?
- 23.4
- 22.8
5 21
10 18 28
15 15 30
20 12 32
25 9 34
……..38
20.
210=2*3*5*7
- 3
2 5
- 7
- 5
- 7
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