UPSKILL MATH PLUS

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(i) $\left(\frac{16}{4}+\frac{-28}{5}\right)$ $$=$$ $\left(\frac{-28}{5}+\frac{16}{4}\right)$ $$=$$ $\frac{i}{i}$.
(ii) $\left(\frac{12}{4}×\frac{4}{7}\right)$$$=$$ $\left(\frac{4}{7}×\frac{12}{4}\right)$ $$=$$ $\frac{i}{i}$.