<span>a) 2z - 12 = 4
2z=4+12
z=8
</span><span>б) 7y-3 = 5-3y
</span>7y+3y=3+5
10y=8
y=0?8
A*2 + b*(-5) = c
a*0 + b*(-2) = c
-2b = c
2a - 5b = -2b
2a = 3b
Пусть b = 2
--> c = -4, a = 3
3x + 2y = -4
(x-4)(x+6)=11
x^2+6x-4x-24=11
x^2+2x-35=0
D=1+35=36=6^2
x1=-1-6=-7 не удовл. усл.
x2=-1+6=5cm
Ответ: 5см
1/3^6*(3^3)^2=1/3^6*3^6=3^6/3^3=1