Wykonajmy obliczenia

a)

$\frac{3}{7}\cdot \left(-4\right)=-\frac{12}{7}=-1\frac{5}{7}$  

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 b)  

$-\frac{4}{5}:\left(-\frac{10}{11}\right)=-\frac{{\sout{4}}^2}{5}\cdot \left(-\frac{11}{{\sout{10}}^5}\right)=-\frac{2}{5}\cdot \left(-\frac{11}{5}\right)=\frac{22}{25}$    

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c)

$-\frac{7}{12}:\frac{6}{14}=-\frac{7}{{\sout{12}}^6}\cdot \frac{{\sout{14}}^7}{6}=-\frac{49}{36}=-1\frac{13}{36}$  

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d)

$2\frac{1}{4}\cdot \left(-\frac{4}{9}\right)=\frac{{\sout{9}}^1}{4}\cdot \left(-\frac{4}{{\sout{9}}^1}\right)=\frac{1}{{\sout{4}}^1}\cdot \left(-{\sout{4}}^1\right)=-1$  

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e)

$-3:5\frac{1}{3}=-3:\frac{16}{3}=-3\cdot \frac{3}{16}=-\frac{9}{16}$    

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f)

$-2\frac{1}{5}\cdot \left(-3\frac{1}{8}\right)=-\frac{11}{{\sout{5}}^1}\cdot \left(-\frac{{\sout{25}}^5}{8}\right)=\frac{55}{8}=6\frac{7}{8}$  

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g)

$\text{g)}-3\frac{1}{8}:\left(-6\frac{3}{8}\right)=-\frac{25}{8}:\left(-\frac{51}{8}\right)=-\frac{25}{{\sout{8}}^1}\cdot \left(-\frac{{\sout{8}}^1}{51}\right)=\frac{25}{51}$  

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h)  

$\text{h)}3,2:\left(-8\right)=-0,4$  

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i)

$-1,6\cdot \left(-0,2\right)=0,32$  

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j)   

$-1,6:4=-0,4$  

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k)  

$-2,2\cdot \left(-0,1\right)=0,22$  

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l)

$-5,2:\left(-2\right)=2,6$  

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m)   

$2,4:\left(-0,6\right)=24:\left(-6\right)=-4$  

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n)  

$-2:\left(-0,25\right)=-200:\left(-25\right)=8$