Question
$\frac{4}{6}-\frac{3}{5}$
$\begin{aligned} \frac{4}{6}-\frac{3}{5} & =\frac{4 \times 5}{6 \times 5}-\frac{3 \times 6}{5 \times 6} \\ & =\frac{20}{30}-\frac{18}{30} \\ & =\frac{20-18}{30}=\frac{2}{30}\end{aligned}$
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(1) If OP = 4cm then AB = _________ cm, OA = _________ cm, OB = _________ cm.
(2) If AB = 10 cm then OA = _________ cm, OB = _________ cm, OP = _________ cm.

(1) XXV
(2) XXIX.
