1
x²-5x-24=0
x1+x2=5 U x1*x2=-24⇒x1=-3 U x2=8
x²-6x-27=0
x1+x2=6 U x1*x2=-27⇒x1=-3 U x2=9
(x²-5x-24)/(x²-6x-27)=(x+3)(x-8)/(x+3)(x-9)=(x-8)/(x-9)
2
(a²-6)/(a²-2√6a+6)=(a-√6)(a+√6)/(a-√6)²=(a+√6)/(a-√6)
1)0.3×30-1/4×8=7
2)8√201/4-0.6/0.1=8√201/4-2 А дальше проверь написание там точно 8√201
((cos a)^3-(sin a)^3)/(1+sin a*cos a)=