\(27y^3+9y^2+y+\frac{1}{27}\)
\(=\left(3y+\frac{1}{3}\right)^3\)
p/s: chúc bạn học tốt
\(27y^3+9y^2+y+\frac{1}{27}\)
\(=\left(3y\right)^3+3\cdot\left(3y\right)^2\cdot\frac{1}{3}+3\cdot3y\cdot\left(\frac{1}{3}\right)^2+\left(\frac{1}{3}\right)^3\)
\(=\left(3y+\frac{1}{3}\right)^3\)
\(27y^3+9y^2+y+\frac{1}{27}=\left(3y+\frac{1}{3}\right)^3\)
=.= hok tốt!!
\(27y^3+9y^2+y+\frac{1}{27}\)
\(=\left(3y\right)^3+3.3y^2+3.\frac{1}{3}y+\left(\frac{1}{3}\right)^3\)
\(=\left(3y+\frac{1}{3}\right)^3\)