8s^3+2s^2+12+4s^2-6s^3+s^3-6s^2-8= 3s^3+4
4х - х^2=0
х (4-х) = 0
х = 0
4-х = 0
х= 4
ВРОДЕ ТАК!)
2*0,545³+2*0,455³=2[(0.545+0.455)(0.545²-0.545*0.455+0.455²]=
2*1*(0.545²+0.455²)
2(0.545²+0.455²)-3(0.545²+0.455²)=-(0.545²+0.455²)= - (0.297025+0.207025)= - 0.50405