$$7/9 \times 21/5 \times 25( { 65 }^{ 2 } - { 55 }^{ 2 } )$$
$98000$
$$\frac{\frac{7\times 21}{9}}{5}\times 25\left(65^{2}-55^{2}\right)$$
$$\frac{\frac{147}{9}}{5}\times 25\left(65^{2}-55^{2}\right)$$
$$\frac{\frac{49}{3}}{5}\times 25\left(65^{2}-55^{2}\right)$$
$$\frac{49}{3\times 5}\times 25\left(65^{2}-55^{2}\right)$$
$$\frac{49}{15}\times 25\left(65^{2}-55^{2}\right)$$
$$\frac{49\times 25}{15}\left(65^{2}-55^{2}\right)$$
$$\frac{1225}{15}\left(65^{2}-55^{2}\right)$$
$$\frac{245}{3}\left(65^{2}-55^{2}\right)$$
$$\frac{245}{3}\left(4225-55^{2}\right)$$
$$\frac{245}{3}\left(4225-3025\right)$$
$$\frac{245}{3}\times 1200$$
$$\frac{245\times 1200}{3}$$
$$\frac{294000}{3}$$
$$98000$$
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$2^{4}\times 5^{3}\times 7^{2}$
