Question

Va rog ex 6 dau coroana

Answer 1

Se respecta regula : produsul mezilor = produsul extremilor :
$\frac{a}{b} = \frac{c}{d} \ \textless \ =\ \textgreater \ a*d=b*c$
5·20=(3x+4)(y+2)
100=(3x+4)(y+2) <=>3x+4=10 =>3x=6 =>x=2
                                    y+2=10 =>y=10-2 =>y=8

Verif : (3·2+4)(8+2)=?100
               10·10=100 Adevarat