Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$(a^{-1}+b^{-1})^{-1}$$

Evaluate

$\frac{ab}{a+b}$

Factor

$\frac{ab}{a+b}$

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