#1
(1/2)⁴*32-(0,1)³*200=2-0,2=1,8
#2
(10x+3)+(12x-4)=7-(15-22x)
10x+3+12x-4=7-15+22x
22x-22x=-8+1
0x=-7
нет корня
#3
(27²*9⁴)/81²=(3³)²*(3²)⁴)/(3⁴)²=(3^6*3^8)/3^8=3^7
#4
{3x-y=3|*2
{5x+2y=16
+{6x-2y=6
+{5x+2y=16
11x=22|:11
x=2
3*2-y=3
-y=3-6
-y=-3|:(-1)
y=3
#5
122-23-19=80°
#6
y=-x/3+1
#7
AOC-X
COB-2X
x+2x=120
3x=120|:3
x=40°
#8
C-x
50+x/12+x=180
1 1/12x=180-50
13/12x=130|:13/12
x=130*12/13=120°-C
B=120/12=10℅
#9
(a-2)(a+7)-(a+4)(a-3)=a²+7a-2a-14-(a²-3a+4a-12)=a²+5a-14-a²+3a+4a+12=12a+12
a=-3/4
-3/4*12+12=-9+12=3