7z²+35z-z-5=0
7z²+34z-5=0
D/4=(b/2)²-ac=17²+7*5=289+35=324=18²
z1=(-b/2+√D/4)/a=(-17+18)/7=1/7
z2=(-17-18)/7=-35/7=-5
z1=1/7
z2=-5.
5/8-7/12=15/24-14/24=1/24
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\= 0.1
1/8 y^4 - 7/8 y^2- 1=0
y^4-7y^2-8=0
y^2=t
t^2-7t-8=0
t1=8
y1=+корень(8)
y2=-корень(8)
<span>t1=-1 решений нет</span>