Đáp án:
Giải thích các bước giải:
c. 6$\frac{5}{12}$ : 2$\frac{3}{4}$ - 11$\frac{1}{4}$.$\frac{1}{5}$ - $\frac{1}{3}$
= $\frac{77}{12}$ : $\frac{11}{4}$ - $\frac{45}{4}$.$\frac{1}{5}$ - $\frac{1}{3}$
= $\frac{77}{12}$ . $\frac{4}{11}$ - $\frac{9}{4}$.$\frac{1}{1}$ - $\frac{1}{3}$
= $\frac{7}{3}$ . $\frac{1}{1}$ - $\frac{9}{4}$ - $\frac{1}{3}$
= $\frac{7}{3}$ - $\frac{9}{4}$ - $\frac{1}{3}$
= $\frac{28}{12}$ - $\frac{27}{12}$ - $\frac{4}{12}$
= $\frac{-3}{12}$ = $\frac{-1}{4}$
d. -1$\frac{1}{3}$.($\frac{3}{4}$ - $\frac{7}{8}$) - $\frac{2}{7}$.(3,5)²
= $\frac{-4}{3}$.($\frac{6}{8}$ - $\frac{7}{8}$) - $\frac{2}{7}$.($\frac{7}{2}$)²
= $\frac{-4}{3}$.$\frac{-1}{8}$ - $\frac{2}{7}$.$\frac{49}{4}$
= $\frac{-1}{3}$.$\frac{-1}{2}$ - $\frac{1}{1}$.$\frac{7}{2}$
= $\frac{1}{6}$ - $\frac{7}{2}$
= $\frac{1}{6}$ - $\frac{21}{6}$
= $\frac{-20}{6}$ = $\frac{-10}{3}$
