Răspuns:
[tex]c)(3 \frac{3}{4} \times ((1 \frac{13}{35} \times 5 \frac{1}{4} - 7 \frac{1}{21} ) \div 1 \frac{1}{7} - 1 \frac{1}{3} )) \div 1\frac{7}{8} = \\ = ( \frac{3 \times 4 + 3}{4} \times (( \frac{1 \times 35 + 13}{35} \times \frac{5 \times 4 + 1}{4} - \frac{7 \times 21 + 1}{21} ) \div \frac{1 \times 7 + 1}{7} - \frac{1 \times 3 + 1}{3} )) \div \frac{1 \times 8 + 7}{8} = \\ = ( \frac{15}{4} \times (( \frac{48}{35} \times \frac{21}{4} - \frac{148}{21}) \div \frac{8}{7} - \frac{4}{3} )) \div \frac{15}{8} = \\ = ( \frac{15}{4} \times (( \frac{12}{5} \times \frac{3}{1} - \frac{ {148} }{21} ) \div \frac{8}{7} - \frac{4}{3} )) \div \frac{15}{8} = \\ = ( \frac{15}{4} \times (( \frac{36}{5} - \frac{148}{21} ) \div \frac{8}{7} - \frac{4}{3} )) \div \frac{15}{8} = \\ = ( \frac{15}{4} \times (( \frac{36 \times 21}{105} - \frac{148 \times 5}{105} ) \div \frac{8}{7} - \frac{4}{3} )) \div \frac{15}{8} = \\ = ( \frac{15}{4} \times (( \frac{756}{105} - \frac{740}{105} ) \times \frac{7}{8} - \frac{4}{3} )) \times \frac{8}{15} = \\ = ( \frac{15}{4} \times ( \frac{16}{105} \times \frac{7}{8} - \frac{4}{3} ) )\times \frac{8}{15} = \\ = ( \frac{15}{4} \times ( \frac{2}{15} - \frac{4}{3} )) \times \frac{8}{15} = \\ = ( \frac{15}{4} \times ( \frac{2 \times 2}{30} - \frac{4 \times 10}{30} )) \times \frac{8}{15} = \\ = ( \frac{15}{4} \times ( \frac{4}{30} - \frac{40}{30} )) \times \frac{8}{15} = \\ = ( \frac{15}{4} \times ( \frac{ - 36}{30} )) \times \frac{8}{15} = \\ = ( 1 \times (\frac{ - 9}{2})) \times \frac{8}{15} = \\ = - \frac{9}{2} \times \frac{8}{15} = \frac{ - 72}{30} = \frac{ - 36}{15} = \frac{ - 12}{5} [/tex]
Sper sa nu fi greșit la calcule sau sa uit sa scriu ceva sau sa fi copiat greșit dar asa imi da
