Chislitelni ravni⇒znamenatelni toje ravni,( pri etom 4x+1≠0⇒x≠-1/4)⇒
4x+1=8⇒4x=8-1⇒4x=7⇒x=7/4
Вот
понятно *******************
x=6-y
6-y+y+y(6-y)²+y²(6-y)=24
6+y³-12y²+36y+6y²-y³=24
-6y²+36y-18=0
y²-6y+3=0
D= 36-12= 24
y1= (6+√24)/2= 3+√6
y2= (6-√24)/2= 3-√6
x1= 6-3-√6= 3-√6
x2= 6-3+√6= 3+√6
пары чисел: (3-√6;3+√6) и (3+√6;3-√6)
SABC=1/2 AB*CK=1/2*18*12=108 SABC=1/2 AC*BH=1/2*27*BH 1/2 *27*BH=108 BH=108*2/27=8