x/y=2/7 atunci raportul 2x+y/3y-5x =?

Răspuns:
1
Explicație pas cu pas:
x/y=2/7 => 2x2 +7/3x7 - 5x2
11/21-10= 11/11 = 1
Răspuns:
x=2y/7
[(2·2y/7)+⁷⁾y]/[⁷⁾3y-5(2y/7)]=
(4y/7+7y/7)/(21y/7-10y/7)=
11y/7:11y/7=11y/7·7/11y=
1