Ответ:
Пошаговое объяснение:
1)3(x-2)=4x => 3x-6=4x =>3x-4x=6 => -x=6 *(-1) => x=-6; 2) 6(z-1)=18 => 6z-6=18 => 6z=18+6 => 6z=24 (:6) => z=4
Ответ:75 105/7=15
15*5=75
2sin 2x -1 = 0
2sin 2x = 1
sin 2x = 1/2
2x = { π/6+ 2πn, n∈Z
{ 5π/6+2πn, n∈Z <=> (-1)^{n}*π/6 + πn,n∈Z | :2
x = {π/12 + πn, n∈Z
{5π/12 + πn,n∈Z <=> (-1)^{n} * π/12 +πn/2, n∈Z
S = 7,5 * 10 ( 1/8 ) = 15/2 * 81/8 = 1215/16 = 75,9375 ( кв см )