6x^2y^2/x+y * (x+y)(x-y)/y^2x^2 = 6* (x-y)=6x-6y
Дальше не знаю 3 коэффициент
X²/(4+x)=16/(4+x)
x²/(4+x)-16/(4+x)=0
x²-16/(4+x)=0
x²-16=0
4+x≠0
x²=16
x≠-4
x=4
x≠-4
Ответ: х=4
x/(20-x)=1/x
x/(20-x)-1/x=0
x²-20+x/(x(20-x)=0
x²+x-20=0
x≠0
20-x≠0
x₁=5
x₂=-4
x≠0
x≠-20
0, 0(3) = 3/90
0, 0(72) = 72/990
2, (8) = (28 - 2)/9 = 26/9
<span>0, 12(0) = 12/100</span>