Răspuns :
1/z+1/b aducem la acelasi numitor si obtinem: b/ab+a/ab=(a+b)/ab inlocuim cu
a+b=12 si ab=24 obtinem (a+b)/ab=12/24=1/2
a+b=12 si ab=24 obtinem (a+b)/ab=12/24=1/2
a + b = 12
a * b = 24
[tex] \frac{1}{a}+ \frac{1}{b}=\frac{b}{ab}+ \frac{a}{ab} = \frac{a+b}{ab}=\frac{12}{24}= \frac{1}{2} [/tex]
a * b = 24
[tex] \frac{1}{a}+ \frac{1}{b}=\frac{b}{ab}+ \frac{a}{ab} = \frac{a+b}{ab}=\frac{12}{24}= \frac{1}{2} [/tex]