Bài 1:
b) \(4x^2-4x+1\)
\(=\left(2x\right)^2-2.2x.1+1\)
\(=\left(2x-1\right)^2.\)
c) \(2xy+3z+6y+xz\)
\(=\left(2xy+6y\right)+\left(3z+xz\right)\)
\(=2y.\left(x+3\right)+z.\left(x+3\right)\)
\(=\left(x+3\right).\left(2y+z\right)\)
d) \(x^3+\frac{1}{27}\)
\(=x^3+\left(\frac{1}{3}\right)^3\)
\(=\left(x+\frac{1}{3}\right).\left[x^2-\frac{1}{3}x+\left(\frac{1}{3}\right)^2\right]\)
\(=\left(x+\frac{1}{3}\right).\left(x^2-\frac{1}{3}x+\frac{1}{9}\right)\)
Chúc bạn học tốt!
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