Question

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

Answer 1

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