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(X-5/2) la a 2 -(x+5/2)la a 2

Răspuns :

[tex](x- \frac{5}{2})^2-(x+ \frac{5}{2})^2=(x- \frac{5}{2} -x- \frac{5}{2})(x- \frac{5}{2}+x+ \frac{5}{2})=-5*2x= \\ =-10x[/tex]