Răspuns :
[tex] 5\frac{1}{4}= \frac{5\cdot4+1}{4}= \frac{21}{4} [/tex]
[tex]\displaystyle 5 \frac{1}{4} = \frac{5 \cdot 4+1}{4} = \frac{20+1}{4} = \boxed{\frac{21}{4} }[/tex]