40/5=8 (кг) в 1 мешке.8+2= 10 (кг) стало в каждом мешке.<span>40/10=4 (м) потребуеться.</span>
3,6+2,4:(11,7-3,7)= 3,9
1) 11,7-3,7=8
2) 2,4/8=0,3
3) 3,6+0,3=3,9
BO,OD,BD,DA,AO,OC,AC
MK,KN,NP,KP,MN,MP,FK,KE,FE,SN,NE,SE
Левая часть. Разность кубовsin^3 x - cos^3 x = (sin x - cos x)(sin^2 x + sin x*cos x + cos^2 x)Правая часть1 + sin 2x / 2 = sin^2 x + cos^2 x + sin x*cos xПолучаем(sin x-cos x)(sin^2 x+sin x*cos x+cos^2 x) = sin^2 x+cos^2 x+sin x*cos x(sin^2 x + cos^2 x + sin x*cos x)(sin x - cos x - 1) = 01) sin^2 x + cos^2 x + sin x*cos x = 0 1 + sin 2x / 2 = 0sin 2x = -2 - решений нет2) sin x - cos x - 1 = 02sin(x/2)*cos(x/2) - cos^2(x/2) + sin^2(x/2) - cos^2(x/2) - sin^2(x/2) = 02sin(x/2)*cos(x/2) - 2cos^2(x/2) = 02cos(x/2)*(sin(x/2) - cos(x/2)) = 0cos(x/2) = 0; x/2 = pi/2 + pi*k; x1 = pi + 2pi*k
sin(x/2) - cos(x/2) = 0sin(x/2) = cos(x/2)tg(x/2) = 1; x/2 = pi/4 + pi*k; x2 = pi/2 + 2pi*k