Giải câu 7 trang 43 Cánh Diều Toán 6 tập 2.
a) $\frac{17}{8}$ : ( $\frac{27}{8}$ + $\frac{11}{2}$ ) = $\frac{17}{8}$ : ( $\frac{27}{8}$ + $\frac{11 . 4}{2 . 4}$ ) = $\frac{17}{8}$ : ( $\frac{27}{8}$ + $\frac{44}{8}$ ) = $\frac{17}{8}$ : $\frac{71}{8}$ = $\frac{17}{8}$ . $\frac{8}{71}$ = $\frac{17}{71}$
b) $\frac{28}{15}$ . $\frac{1}{4^{2}}$ . 3 + ( $\frac{8}{15}$ - $\frac{69}{60}$ . $\frac{5}{23}$ ) : $\frac{51}{54}$
$\frac{28}{15}$ . $\frac{1}{16}$ . 3 + ( $\frac{8}{15}$ - $\frac{69 . 5}{60 . 23}$ ) . $\frac{54}{51}$
= $\frac{28 . 1. 3}{15 . 16}$ + ( $\frac{8}{15}$ - $\frac{69 . 5}{60 . 23}$ ) . $\frac{54}{51}$
= $\frac{7}{20}$ + ( $\frac{8}{15}$ - $\frac{1}{4}$ ) . $\frac{54}{51}$
= $\frac{7}{20}$ + ( $\frac{8 . 4}{15 . 4}$ - $\frac{1 . 15}{4 . 15}$ ) . $\frac{54}{51}$
= $\frac{7}{20}$ + ( $\frac{32}{60}$ - $\frac{15}{60}$ ) . $\frac{54}{51}$
= $\frac{7}{20}$ + $\frac{17}{60}$ . $\frac{54}{51}$
= $\frac{7}{20}$ + $\frac{17 . 54}{60 . 51}$ . $\frac{54}{51}$
= $\frac{7{20}$ + $\frac{918}{3060}$
= $\frac{7}{20}$ + $\frac{3}{10}$
= $\frac{7}{20}$ + $\frac{3 . 2}{10 . 2}$
= $\frac{7}{20}$ + $\frac{6}{20}$
= $\frac{14}{20}$
= $\frac{7}{10}$