X x 4+ \(\frac{X}{3}=39\)
\(X\) x 4+ \(X\) X\(\frac{1}{3}=39\)
\(X\) X(\(4+\frac{1}{3}\))=39
\(X\) X\(\frac{13}{3}=39\)
\(X\)=39:\(\frac{13}{3}\)
\(X\)=9
x x 4 + x/3 = 39
x x 4 + x : 3 = 39
x x 4 + x x 1/3 = 39
x x (4 + 1/3) = 39
x x 13/3 = 39
x = 39 : 13/3
x = 9
Chúc bạn học tốt.
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