1085:5=217;
5/9:(7/9+11/18)=5/9:(14/18+11/18)=5/9:25/18=10/18:25/18=10/18*18/25=10*18/18*25=
=10/25=2/5;
8/7=336 336:8=42 42*7=294;
-8,8+6,5*1,6=-8,8+7,3=-1,5;
x-5(x-3) при x=8
8-5(8-3)=8-5(5)=8-25=-17;
Решение
y = cosx / (5 - 3x)
y` = [-sinx*(5 - 3x) + 3*cosx] / (5 - 3x)²
y`(0) = [- sin0 * (5 - 3x) + 3*cos0] / 5² = 3/25
36х+90+3=30х+55-4
6х=51-3-90
6х=-42
х=-7