Question

(4/5-3/4)•(3/4-4/5)=
(3,42-3/4):(4/5+4,3)=

Answer 1

а) ($frac{4}{5} - frac{3}{4}$) × ($frac{3}{4} - frac{4}{5}$) = ($frac{16-15}{20}$) ×($frac{15-16}{20}$) = $frac{1}{20}$ × (-$frac{1}{20}$) = -$frac{1}{400}$
б) (3,42-3/4):(4/5+4,3)= (3$frac{42}{100}$ - $frac{3}{4}$) : ($frac{4}{5}$ + 4 $frac{3}{10}$) = ($frac{342}{100}$ - $frac{3}{4}$) : ($frac{4}{5} + frac{43}{10}$) = ($frac{342-75}{100}$) : ($frac{8+43}{10}$) = $frac{267}{100} : frac{51}{10}$ = $frac{267}{100} * frac{10}{51}$ = $frac{89}{170}$ ≈ 0,5