Question

Stiind ca a+b=18si a×b=72, calculeaza 1supra a+1 supra b

Answer 1

$\left \{ {a+b=18} \atop {a*b=72}} \right.$

$\frac{ ^{(b} 1}{a}+ \frac{^{(a}1}{b}= \frac{b+a}{a*b} = \frac{a+b}{a*b} = \frac{18}{72} = \frac{1}{4}$