2024年灘中算数1日目1番

$$1\div \left\{ \frac{1}{9} - 1 \div ( 35 \times 35 + 32 \times 32 ) \right\}$$ $$= 9 + \frac{81}{\Box}$$

$$1\div \left\{ \frac{1}{9} - 1 \div ( 35 \times 35 + 32 \times 32 ) \right\}$$ $$= 1 \div \left(\frac{1}{9}-\frac{1}{3249}\right)$$ $$= 1 \div \frac{2249 - 9}{9 \times 2249}$$ $$= \frac{9 \times (2240+9)}{2240}$$ $$= \frac{9 \times 2240}{2240}+\frac{9 \times 9}{2240}$$ $$= 9+\frac{81}{2240}$$