Răspuns :
[tex]7*2 \frac{1}{4} \\ =7* \frac{2*4+1}{4} \\= 7* \frac{9}{4} \\= \frac{63}{4} [/tex]
[tex]2 \frac{1}{4}=\frac{2*4+1}{4} =\frac{8+1}{4} =\frac{9}{4} [/tex]
[tex]7*\frac{9}{4} =\frac{63}{4}[/tex]
[tex]7*\frac{9}{4} =\frac{63}{4}[/tex]