15 + 10 = 25 км/ч (скорость отдаления)
25 * 1 = 25 км - 1 час
25 * 2 = 50 км - 2 часа
<span>25 * 3 = 75 км - 3 часа</span>
128.1*35/100 =44.835
44.835*100/49 =91.5
<span>итого 91.5</span>
Y =2*x/(x+1) ; X(o) =1.
y ' = (2*x/(x+1) ) ' = 2*((x)' *(x+1) - x*(x+1)')/(x+1)² =2*(1 *(x+1) - x*((x)'+(1)') ) /(x+1)² =
2*(x+1 - x*(1+0) ) /(x+1)² = 2*(x+1 - x ) /(x+1)² =2/(x+1)² .
y ' =2/(x+1)² .
При x = X(o) =1 :.
y ' =2/(1+1)² =2/4 =1/2 .
(3/4 - 8/5) + 17/20 = 15/20 - 32/20 + 17/20 = 32/20 - 32/20 = 0