a) \(x^2+6x+9=\left(x+3\right)^2\)
b) \(x^2+x+\frac{1}{4}=\left(x+\frac{1}{2}\right)^2\)
c) \(2xy^2+x^2y^4+1=\left(xy^2+1\right)^2\)
a, \(\left(x+3\right)^2\)
b,\(\left(x+\frac{1}{2}\right)^2\)Mik giải thích tí nè, cái này =\(x^2+2.x.\frac{1}{2}+\frac{1}{4}\)=\(x^2+x+\frac{1}{4}\)
c,thì mik chịu.
a) x2+6x+9
=x2+2.x.3+32
=(x+3)2
b) x2+x+\(\frac{1}{4}\)
=x2+2.x.\(\frac{1}{2}\) +(\(\frac{1}{2}\))2
=(x+\(\frac{1}{2}\))2
c) 2xy2+x2y4+1
=(xy2)2+2.xy2.1+12
=(xy2+1)2