Algebra

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1° ▷ $\big(-\frac{3}{5}\big)÷\big(+\frac{9}{10}\big) = \big(-\frac{3}{5}\big)·\big(+\frac{10}{9}\big) = \big(-\frac{1}{1}\big)·\big(+\frac{2}{3}\big) = -\frac{2}{3}$.

2° ▷ $\big(+\frac{17}{30}\big)÷\big(-\frac{34}{5}\big) = \big(+\frac{17}{30}\big)·\big(+\frac{5}{34}\big) = \big(+\frac{1}{6}\big)·\big(-\frac{1}{2}\big) = -\frac{1}{12}$.

3° ▷ $\big(-\frac{35}{4}\big)÷\big(-\frac{7}{2}\big) = \big(-\frac{35}{4}\big)·\big(-\frac{2}{7}\big) = \big(-\frac{5}{2}\big)·\big(-\frac{1}{1}\big) = +\frac{5}{2}$.

4° ▷ $\big(+\frac{11}{9}\big)÷\big(+\frac{33}{4}\big) = \big(+\frac{11}{9}\big)·\big(+\frac{4}{33}\big) = \big(+\frac{1}{9}\big)·\big(+\frac{4}{3}\big) = +\frac{4}{27}$.