<span>(c-3)×12=20-4×(c+2)
12c-36=20-4c-8
12c+4c=20-8+36
16c=48
c=48:16
с=3
</span>
Решение
arccos(-1/2) - arccos(1/2) = 2π/3 - π/3 = π/3
<span>(a-3)(a-2)-(a-1)^3= a^2 -3a-2a -a^3 +3a^2 -3a +1 =-a^3 +4a^2 -8a +1</span>
(7m-16):(-5) =
= (7m:(-5)) - (16:(-5)) = -1,4m+3,2
Ответ: -1,4m+3,2
A)2^2*5^2<span>=10^2
б)6^3*2^3=12^3
в)3^12=(3^2)^6
г)</span><span>3^12=(3^4)^3</span>