4/b+7/b+2= ...??
помогите пжшка​

Ответ:

[tex] \frac{4}{b} + \frac{7}{b} + 2 = \frac{4 + 7 + 2b}{b} = \frac{11 + 2b}{b} [/tex]

4/b + 7/(b+2) = (4(b+2)+7b)/(b(b+2))=(4b+8+7b)/(b²+2b)=(11b+8)/(b²+2b).