0,05*x+0.4*y=0.3*(x+y)
0.05*x-0.3*x=0.3*y-0.4*y
0.25*x=0.1*y
x:y=4:10
x+y=140
0.4*y+y=140
1.4y=140
y=100
x=40
Ответ 2
-1/3^9 + (-1/3)^4 / -1/3^5 +1 = -1/19683 + 1/81 / -1/243 +1 = 242/19683 / 242/243 =
=1/81
3*(-4)^3-48 / 3*(-4)-6 = 3*(-64) -48 / -12-6 = -240/-18=13.3 или дробь 40/3=13 целых 1/3