Juliatomaszewska870
Rozwiązane

wykonaj mnożenie
a) 4/5 × 3/8
b) 1 1/8 × 7/15
c) 2 1/14 ×(-2 5/22)​



Odpowiedź :

Basetla

[tex]a) \ \frac{4}{5}\times \frac{3}{8} =\frac{1}{5}\times\frac{3}{2} = \frac{3}{10}\\\\\\b) \ 1\frac{1}{8}\times\frac{7}{15} = \frac{9}{8}\times\frac{7}{15} = \frac{3}{8}\cdot\frac{7}{5} = \frac{21}{40}\\\\\\c) \ 2\frac{1}{14}\times(-2\frac{5}{22}) = \frac{29}{14}\cdot(-\frac{49}{22}) = \frac{29}{2}\times(-\frac{7}{22}) = -\frac{203}{44}=-4\frac{27}{44}[/tex]

Odpowiedź:

a)  

[tex]\frac{4}{5} \cdot \frac{3}{8} = \frac{1}{5} \cdot \frac{3}{2} =\frac{3}{10}[/tex]  

b)  

[tex]1\frac{1}{8} \cdot \frac{7}{15} =\frac{9}{8} \cdot \frac{7}{15} =\frac{3}{8} \cdot \frac{7}{5} = \frac{21}{40}[/tex]

c)

[tex]2\frac{1}{14} \cdot \left(-2\frac{5}{22} \right) = \frac{29}{14} \cdot \left(- \frac{49}{22} \right) = - \frac{1421}{308} = - 4\frac{189}{308}[/tex]

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