Stiind ca 3/x=y/0.9,aflati 5xy+6.5
Va rogg,ajutati-ma!!


Răspuns :

3/x=y/0.9 *inmultim in cruce si capatam* xy=3*0.9<=>xy=2.7
5xy+6.5=5*2.7+6.5=13.5+6.5=20