Question

Calculand valoarea numarului x din proportia x+1 supra 1,4= 5 supra 7 se obtine:
A) 9
B) 0
C) 69 supra 7
D)6 supra 7

Answer 1

⇒(x+1)*7=1,4*5⇒7x+7=7⇒7x=7-7⇒x=0

Answer 2

[tex] \frac{x+1}{1,4} = \frac{5}{7} =\ \textgreater \ x+1= \frac{5*1,4}{7} =\ \textgreater \ x+1= \frac{7}{7} \\\\ =\ \textgreater \ x+1=1\\ =\ \textgreater \ x=1-1\\ =\ \textgreater \ x=0\\\\ Deci~rezultatul~final~este~egal~cu~0[/tex]