Question

știind că x supra y egal cu 7 supra 9 calculați 5x +2y supra 2x-y​

Answer 1

Explicație pas cu pas:

x/y=7/9

5x+2y/2x-y

x=7y/9

5(7y/9)+2y/2(7y/9)-y

x=7y/9

35y/9+2y/14y/9-y

x=7y/9

35y/9+18y/9/14y/9-9y/9

x=7y/9

53y/9/5y/9

x=7y/9

53y/9÷5y/9

x=7y/9

53y/9×9/5y

x=7y/9

x=53/5

53/5=7y/9

x=53/5

21y=477

y=477/21

y=159/7