1)5*(1/2)^2+14*1/5 2)x^2=-x+20
1) 5 * (1/2)² + 14 * 1/5= 5 + 14 = 25+56 = 81 =4 ¹/₂₀ =4,05 4 5 20 20 2) х²=-х+20 х²+х-20=0 Д=1-4*(-20)=81 х₁=-1-9= -5 2 х₂=-1+9= 4 2 Ответ: -5; 4.