Simplify the expression — task. Mathematics CBSE, Class 8.

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\frac{21 u^{9}}{u^{2}} - \frac{8 u^{12}}{u^{5}}

\(=\)

i i^{i}

\frac{a^{2}}{3 a^{3} b} + \frac{b^{2}}{5 {a b}^{3}}

\(=\)

\frac{i}{i a b}

[Note: Insert coefficient followed by a variable with its power.]

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10. Simplify the expression