X≠0, y≠0
x-y=6
x=6+y
(6+y)/y + y/(6+y) = 10/3
((6+y)²+y²) / y(6+y) = 10/3
3((6+y)²+y²) = 10y(6+y)
108+36y+6y² = 60y+10y²
4y²+24y-108=0
y²+6y-27=0
D=36-4*(-27)=36+108=144=12²
y1=(-6+12)/2=6/2=3
y2=(-6-12)/2=-18/2=-9
x1=6+3=9
x2=6+(-9)=6-9=-3
ответ: (9;3) (-3;-9)
1
b=q2/q1 = -5/2=-2.5
b=q3/q2=12.5/(-5)=-2.5
Даявляется
bn=(-2.5)^(n-1)*b1=2*(-2.5)^(n-1)
2
b4/b2=q²
q²=56/14=4=+-2
b3=q*b2=28 b -28
6 6/13=84/13
84/13:(11+17)=3/13
(3/13)*11=33/13
(3/13)*17=51/13
33/13=2 7/13
51/13=3 12/13