А) 8(-7)-11(-3)=-23;
8(-3/4)-11*0,6=7,2
б)5*0-4*12=-48
5(-1,2)-4*3,25=-19
Y=sin^3(2x-7)
y'=d/dx(sin^3(2x-7))=>6cos(2x-7)*sin^2(2x-7)
y'=6cos(2*3-7)*sin^2(2*3-7)=2.295
(5x - 3) : 36 = 3 : 4
4 (5x - 3) = 3 * 36
4 (5x - 3) = 108
20x - 12 = 108
20x = 108 + 12
20x = 120
x = 6