С(5, 10) = 10*9*8*7*6 / (1*2*3*4*5) = 9*8*7*6 / (3*4) = 3*2*7*6 = 252
2а*6а^2+ b/3a = 2*0.5 * 6*0.5^2 + (-3/4) / 3*0.5 = 1 * 6*0.25 + (-3/4)*1.5 =
= 1.5 + (-3/4)*1.5 = 1.5 (1 - 3/4) = 1.5* (1/4) = 1.5*.25=0.375
Тут все эллементарно Ватсон)))
Решение
<span>11х-(3х+8)=8х+5
</span>11x - 3x - 8 = 8x + 5
8x - 8x = 5 + 8
0*x = 13
решения нет