Giải câu 7 trang 43 Cánh Diều Toán 6 tập 2

Câu 7 (Trang 43 Cánh Diều Toán 6 tập 2)

a) : ( $\frac{27}{8}$ + $\frac{11}{2}$ )

b) . $\frac{1}{4^2}$ . 3 + ( $\frac{8}{15}$ - $\frac{69}{60}$ . $\frac{5}{23}$ ) : $\frac{51}{54}$

Bài làm:

a) : ( $\frac{27}{8}$ + $\frac{11}{2}$ ) = : ( $\frac{27}{8}$ + $\frac{11.4}{2.4}$ ) = : ( $\frac{27}{8}$ + $\frac{44}{8}$ ) = : $\frac{71}{8}$ = . $\frac{8}{71}$ = $\frac{17}{71}$

b) . $\frac{1}{4^2}$ . 3 + ( $\frac{8}{15}$ - $\frac{69}{60}$ . $\frac{5}{23}$ ) : $\frac{51}{54}$

=

. $\frac{1}{16}$ . 3 + ( $\frac{8}{15}$ - $\frac{69.5}{60.23}$ ) . $\frac{54}{51}$

= + ( $\frac{8}{15}$ - $\frac{69.5}{60.23}$ ) . $\frac{54}{51}$

= + ( $\frac{8}{15}$ - $\frac{1}{4}$ ) . $\frac{54}{51}$

= + ( $\frac{8.4}{15.4}$ - $\frac{1.15}{4.15}$ ) . $\frac{54}{51}$

= + ( $\frac{32}{60}$ - $\frac{15}{60}$ ) . $\frac{54}{51}$

= + $\frac{17}{60}$ . $\frac{54}{51}$

= + $\frac{17.54}{60.51}$ . $\frac{54}{51}$

= + $\frac{918}{3060}$

= + $\frac{3}{10}$

= + $\frac{3.2}{10.2}$

= + $\frac{6}{20}$

=

=