Ответ(ы) на вопрос:
Гость[latex]\frac{5}{21} + \frac{4}{9} = \frac{5*3}{21*3} + \frac{4*7}{9*7} = \frac{15+28}{63} = \frac{43}{63} [/latex]
[latex]- \frac{5}{21}- \frac{4}{9} =- \frac{5*3}{21*3} - \frac{4*7}{9*7} =- \frac{43}{63} [/latex]
[latex] \frac{5}{21}- \frac{4}{9} = \frac{5*3}{21*3}- \frac{4*7}{9*7} = \frac{15-28}{63} = \frac{-13}{63} [/latex]
[latex]- \frac{5}{21} + \frac{4}{9} = \frac{4}{9} - \frac{5}{21} = \frac{4*7}{9*7} - \frac{5*3}{21*3} = \frac{28-15}{63} = \frac{13}{63} [/latex]
Гость5/21+4/9=15+28/63=43/63
-5/21-4/9=-15-28/63=-43/63
5/21-4/9=15-28/63=-13/63
-5/21+4/9=-15+28/63=13/63
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