Question

Am nevoie de ajutor! Dau coroană!​

Answer 1

Bună!

$\frac{28}{31} *[\frac{1}{4} +(2\frac{1}{2}-\frac{7}{4} ):\frac{7}{8} ] =$

$=\frac{28}{31} *[\frac{1}{4} +(^{2)} \frac{5}{2} -\frac{7}{4} )*\frac{8}{7} ]=$

$=\frac{28}{31} (\frac{1}{4}+\frac{3}{4} *\frac{8}{7} )=$

$=\frac{28}{31} *(^{7)} \frac{1}{4}+^{4)} \frac{6}{7} )=$

$=\frac{28}{31} *\frac{31}{28} =$

$=1$