$${ 100 }^{ 2 } \frac { } { 199 } - { 99 }^{ 2 }$$
$-\frac{1940399}{199}\approx -9750.748743719$
$$10000\times \frac{1}{199}-99^{2}$$
$$\frac{10000}{199}-99^{2}$$
$$\frac{10000}{199}-9801$$
$$\frac{10000}{199}-\frac{1950399}{199}$$
$$\frac{10000-1950399}{199}$$
$$-\frac{1940399}{199}$$
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$-\frac{1940399}{199} = -9750\frac{149}{199} = -9750.748743718594$
