Question

$frac{1}{2a} + frac{1}{b} div frac{1}{a}$
если а=5,b=4

Answer 1

$frac{1}{2a}+frac{1}{b}:frac{1}{a}=frac{1}{2a}+frac{1}{b}*a=frac{1}{2a}+frac{a}{b}=frac{b+2a^{2} }{2ab}\\frac{4+2*5^{2} }{2*5*4}=frac{4+50}{40}=frac{54}{40}=1,35$