Răspuns:
[tex]a) 12\frac{9}{10} =\frac{12*10+9}{10} =\frac{120+9}{10} =\frac{129}{10}[/tex]
[tex]b) 14\frac{7}{10} =\frac{14*10+7}{10} =\frac{140+7}{10} =\frac{147}{10}[/tex]
[tex]c) 21\frac{3}{10}=\frac{21*10+3}{10} =\frac{210+3}{10} =\frac{213}{10}[/tex]
