Obliczenia :
[tex](z-9)^2=z^2-2\cdot z\cdot9+9^2=z^2-18z+81\\\\(0,7-w)^2=0,7^2-2\cdot0,7\cdot w+w^2=w^2-1,4x+0,49\\\\(u-2\frac{1}{3})^2=(u-\frac{7}{3})^2=u^2+2\cdot u\cdot\frac{7}{3}+(\frac{7}{3})^2=u^2+4\frac{2}{3}u+5\frac{4}{9}[/tex]
Wzór :
[tex](a-b)^2=a^2-2ab+b^2[/tex]
