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Oblicz: a) 1 4/5+2 1/4=..... b) 5 3/4-2 6/7=.....
plsss szybko​


Odpowiedź :

[tex]a) 1 \frac{4}{5}+2\frac{1}{4}= 1 \frac{16}{20}+2\frac{5}{20}=3\frac{21}{20}=4\frac{1}{20}\\\\b) 5\frac{3}{4}-2\frac{6}{7}=5\frac{21}{28}-2\frac{24}{28}=4\frac{49}{28}-2\frac{24}{28}=2\frac{25}{28}[/tex]