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Calculați 3pe7 + 2 pe 15-8pe 35 +1pe 14

Răspuns :


[tex] \frac{3}{7} + \frac{2}{15} - \frac{8}{35} + \frac{1}{14} = [/tex]
[tex] \frac{30 \times 3 + 14 \times 2 - 6 \times 8 + 15}{210} \\ = \frac{90 + 28 - 48 + 15}{210}= \frac{85}{210} \div 5 = [/tex]
[tex] = \frac{17}{42} [/tex]