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Ajutați-mă va rog!!!
Dau 35 de pct!!


Ajutațimă Va Rog Dau 35 De Pct class=

Răspuns :

Răspuns:

  • [tex]( \frac{2}{5} - \frac{1}{15} + \frac{4}{25} ) \times \frac{20}{3} = \\ ( \frac{30 - 5 + 12}{75} ) \times \frac{20}{3} = \\ \frac{37}{75} \times \frac{20}{3} = \frac{37}{15} \times \frac{4}{3 } = \frac{148}{45} [/tex]

  • [tex]( \frac{2}{3} + \frac{7}{9} - \frac{5}{27} ) \div \frac{2}{36} = \\ ( \frac{18 + 21 - 5}{27} ) \div \frac{2}{36} = \\ \frac{34}{27} \times \frac{36}{2} = \frac{34}{27} \times 18 = \frac{34}{3} \times 2 = \frac{68}{3} [/tex]

  • [tex]( \frac{1}{18} - \frac{3}{6} + \frac{5}{24} ) \times \frac{16}{5} = \\ ( \frac{1}{18} - \frac{1}{2} + \frac{5}{24} ) \times \frac{16}{5} = \\ ( \frac{4 - 36 + 15}{72} ) \times \frac{16}{5} = \\ - \frac{17}{72} \times \frac{16}{5} = - \frac{17}{9} \times \frac{2}{5} = - \frac{34}{45} [/tex]

  • [tex](2 \frac{1}{5} + \frac{4}{9} - \frac{8}{15} ) \times \frac{25}{3} = \\ ( \frac{11}{5} + \frac{4}{9} - \frac{8}{15} ) \times \frac{25}{3} = \\ ( \frac{99 + 20 - 24}{45} ) \times \frac{25}{3} = \\ \frac{95}{45} \times \frac{25}{3} = \frac{19}{9} \times \frac{25}{3} = \frac{475}{27} [/tex]

  • [tex]( \frac{6}{7} - \frac{2}{21} + \frac{5}{42} ) \div \frac{8}{35} = \\ ( \frac{36 - 4 + 5}{42} ) \div \frac{8}{35} = \\ \frac{37}{42} \times \frac{35}{8} = \frac{37}{6} \times \frac{5}{8} = \frac{185}{48} [/tex]

  • [tex]( \frac{1}{3} - \frac{2}{5} )( \frac{6}{5} + \frac{3}{15} ) = \\ ( \frac{5 - 6}{15} )( \frac{6 + 1}{5} ) = - \frac{1}{15} \times \frac{7}{5} = - \frac{7}{75} [/tex]

  • [tex]( \frac{2}{7} - \frac{1}{5} + \frac{1}{70} ) \div \frac{5}{63} = \\ ( \frac{20 - 14 + 1}{70} ) \div \frac{5}{63} = \frac{7}{70} \div \frac{5}{63} = \\ \frac{1}{10} \times \frac{63}{5} = \frac{63}{50} [/tex]