17) 40
18) 17
19) 4/3
20) 11
1) 195 ÷ 13 × 9 = 135 - яблони
2) 195 - 135 = 60 - вишни
Ответ: 60
<span>{112=b1*(1+q+q^2)
{14=b1*q^3*(1+q+q^2)
q=(7/56)^(1/3) b1=112/(1+(7/56)^(1/3)+(7/56)^(2/3))
S(5)=S(6)-b1*q1^5
s(5)=126-112*(7/56)^(1/3)/(1+(7/56)^(1/3)+(7/56)^(2/3))</span>