Đáp án:
Giải thích các bước giải:
a) Ta có:
$\frac{a}{b}=\frac{-3\frac{2}{5}}{\frac{34}{5}}\\=-\frac{\frac{17}{5}}{\frac{34}{5}}\\=-\frac{5\times 17}{34\times 5}\\=-\frac{17}{34}\\=-2$
b) $-\frac{3}{5}\times \frac{7}{11}+\frac{4}{11}(-\frac{3}{5})+1\frac{2}{3}\\=-\frac{3}{5}(\frac{7}{11}+\frac{4}{11})\\=-\frac{3}{5}\times 1+\frac{5}{3}\\=-\frac{3}{5}+\frac{5}{3}\\=\frac{16}{15}$