Question

Determină X din egalitățile :
a) x+2 supra x = 9 supra 7
b) x supra x+1 = 2 supra 13
c) x supra 5 = x+2 supra 25

repede va rog !

Answer 1

a) x+2/x=9/7⇒7(x+2)=9x⇒7x+14=9x⇒7x-9x=-14⇒-2x=-14⇒2x=14⇒x=7

b) x/x+1=2/13⇒2(x+1)=13x⇒2x+2=13x⇒2x-13x=-2⇒-11x=-2⇒11x=2⇒x=2/11

c) x/5=x+2/25⇒5(x+2)=25x⇒5x+10=25x⇒5x-25x=-10⇒-20x=-10⇒20x=10⇒

⇒x=1/2