(x^2-5x)+5-x=0
x^2-5x+5-x=0
x^2-6x+5=0
d=36-4*5=36-20=16
x1=(6 +4) /2=5
x2=(6-4)/2=1
Ответ :1;5.
sin^2a/cos^2a-sin^2a=sim^2a(1-cos^2a)/cos^2a=sin^2a*sin^2a/cos^2a=tg^2a*sin^2a
1-tg^2a+tg^4a/cos^2a=1-sin^2a/cos^2a+tg^4a/cos^2a=(cos2a+tg^4a)/cos^2a
B1*q^6-b1*q^4=48
b1*q^5+b1*q^4=48
b1q^4(q^2-1)=48
b1q^4(q+1)=48
(q^2-1)/(q+1)=1
q-1=1
q=2
b1*16*3=48 b1=1