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Bombonika21
a fost răspuns

simplificati rapoartele :
a)x²+3x/x²-9
b)x²-49/x²+14x+49
va roooggggggggggggg


Răspuns :

Macks
x²+3x/x²-9=x(x+3)/(x-3)(x+3)=x/x-3;
x²-49/x²+14x+49=(x-7)(x+7)/(x+7)²=x-7/x+7;
Bafta!
[tex] \frac{x^{2}+3x }{ x^{2} -9} [/tex] = [tex] \frac{x(x+3)}{(x+3)(x-3)} [/tex]
Vom simplifica x+3 : [tex] \frac{x}{x-3} [/tex] Fractia are sens doar pentru 
x ≠ 3 si x ≠ -3 .
[tex] \frac{x^{2} -49}{ x^{2} +14x+49} [/tex] = [tex] \frac{(x+7)(x-7)}{ (x+7)^{2} } [/tex] 
Vom simplifica x+7 : [tex] \frac{x-7}{x+7} [/tex] Fractia are sens doar pentru
x ≠ -7 .