Kiarakiaraofficalviz
Rozwiązane

działania na liczbach klasa 8 str 9 zad 5 b

b) 2 i 1/ 10 - 3/4 =

1 i 7/18 - 2 i 2/9 =

2 i 1/7 - 5 i 2/3 =
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Odpowiedź :

AstraySpirit2308viz

Obliczenia

[tex]2\frac{1}{10}-\frac{3}{4}=2\frac{2}{20}-\frac{15}{20}=1\frac{22}{20}-\frac{15}{20}=1\frac{7}{20}\\\\1\frac{7}{18}-2\frac{2}{9}=1\frac{7}{18}-2\frac{4}{18}=-(2\frac{4}{18}-1\frac{7}{18})=-(1\frac{22}{18}-1\frac{7}{18})=-\frac{15}{18}=-\frac{5}{6}\\\\2\frac{1}{7}-5\frac{2}{3}=-(5\frac{2}{3}-2\frac{1}{7})=-(5\frac{14}{21}-2\frac{3}{21})=-3\frac{11}{21}[/tex]

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