Răspuns:
[tex]\boldsymbol{ \red{5}}[/tex]
Explicație pas cu pas:
[tex]x + \dfrac{x}{2} + \dfrac{x}{4} + 1 = 9,75[/tex]
[tex]^{4)} x + \dfrac{^{2)} x}{2} + \dfrac{x}{4} = 9,75 - 1[/tex]
[tex]\dfrac{4x + 2x + x}{4} = 8,75[/tex]
[tex]\dfrac{7x}{4} = 8,75 \Rightarrow x = \dfrac{4 \cdot 8,75}{7}[/tex]
[tex]\Rightarrow x = 5[/tex]