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Ma=x+9,25/2 =7,35.
x=????
VA ROG FRUMOS
"/"=SUPRA
25 SUPRA 2


Răspuns :

[tex]m_a= \dfrac{x+9,25}{2}=7,35 \Longrightarrow x+9,25=7,35\cdot2 \\\;\\ \Longrightarrow x+9,25=14,70 \Longrightarrow x=14,70-9,25\ \Longrightarrow x = 5,45[/tex]