3㏒₂80/(㏒₂16+㏒₂5)=3㏒₂80/㏒₂16·5=3㏒₂80/㏒₂80=3
y=6/x³−16x
х³-16х≠0
х(х²-16)≠0
х₁≠0 х₂≠4 х₃≠-4
х∈(-∞;-4)∪(-4;0)∪(0;4)∪(4;+∞)
X^2+2xy+y^2=(x+y)^2
a^2+2a+1=(a+1)^2
b^2-6b+9=(b-3)^2
c^2-10c+25(c-5)^2
4m^2+4m+1=(2m+1)^2
16-8c+c^2=(4-c)^2
Зх-2>8X+13
3X-8X>13+2
-5X>15
X>-3