Odpowiedź:
1.
[tex]4,5+(-2\frac{1}{4})=4\frac{10}{20}-2\frac{5}{20}=2\frac{1}{4}\\\\8,25-6=2,25 = 2\frac{1}{4}\\[/tex]
PRAWDA
[tex](-2\frac{4}{5})-6,7=-2\frac{8}{10}-6\frac{7}{10} = 8\frac{15}{10}=9\frac{1}{2}\\\\-13,5+3=-10,5=-10\frac{1}{2}\\[/tex]
FAŁSZ
2.
[tex]X=8\frac{1}{4}-(1\frac{1}{8})=8\frac{2}{8}-1\frac{1}{8}=7\frac{1}{8}\\\\Y= -2,4+1\frac{2}{5}=-2\frac{2}{5}+1\frac{2}{5}=-1[/tex]