$\big(\frac{3}{7}+\frac{13}{42}·\frac{6}{13}\big)·\frac{21}{16}+\big(\frac{8}{5}-\frac{3}{10}+\frac{5}{2}\big)·\frac{6}{19}$=
=$\big(\frac{3}{7}+\frac{1}{7}·\frac{1}{1}\big)·\frac{21}{16}+\big(\frac{16-3+25}{10}\big)·\frac{6}{19}$=
=$\big(\frac{3}{7}+\frac{1}{7}\big)·\frac{21}{16}+\frac{38}{10}·\frac{6}{19}$=
=$\frac{4}{7}·\frac{21}{16}+\frac{19}{5}·\frac{6}{19}$=
=$\frac{1}{1}·\frac{3}{4}+\frac{1}{5}·\frac{6}{1}$=
=$\frac{3}{4}+\frac{6}{5}$=
=$\frac{15+24}{20}$=
=$\frac{39}{20}$.
@gramor Grazie mille ,mi puoi aiutare anche con un altro es ? graziee
@DenisaGabriela - Purtroppo si legge male, è un po' sfocato, tu magari controlla se ho trascritto bene.
$\frac{1}{2}+\big(\frac{1}{6}+\frac{7}{10}-\frac{4}{5}+\frac{1}{3}\big)\big(\frac{2}{3}+\frac{3}{2}-\frac{1}{8}·\frac{16}{3}+\frac{1}{6}\big)+\frac{2}{3}$=
=$\frac{1}{2}+\big(\frac{5+21-24+10}{30}\big)\big(\frac{2}{3}+\frac{3}{2}-\frac{1}{1}·\frac{2}{3}+\frac{1}{6}\big)+\frac{2}{3}$=
=$\frac{1}{2}+\frac{12}{30}·\big(\frac{2}{3}+\frac{3}{2}-\frac{2}{3}+\frac{1}{6}\big)+\frac{2}{3}$=
=$\frac{1}{2}+\frac{2}{5}·\big(\frac{4+9-4+1}{6}\big)+\frac{2}{3}$=
=$\frac{1}{2}+\frac{2}{5}·\frac{10}{6}+\frac{2}{3}$=
=$\frac{1}{2}+\frac{2}{5}·\frac{5}{3}+\frac{2}{3}$=
=$\frac{1}{2}+\frac{2}{1}·\frac{1}{3}+\frac{2}{3}$=
=$\frac{1}{2}+2·\frac{1}{3}+\frac{2}{3}$=
=$\frac{1}{2}+\frac{2}{3}+\frac{2}{3}$=
=$\frac{3+4+4}{6}$=
=$\frac{11}{6}$.
(18+6) /42 *21/16 +(16-3+25)/10 *6/19 =
= 24/42*21/16+38/10*6/19 =
= 3/4+6/5 =
= (15+24)/20 =
= 39/20