$$\frac{ { 100 }^{ 2 } }{ 199 } - \frac{ { 99 }^{ 2 } }{ 199 }$$
$1$
$$\frac{10000}{199}-\frac{99^{2}}{199}$$
$$\frac{10000}{199}-\frac{9801}{199}$$
$$\frac{10000-9801}{199}$$
$$\frac{199}{199}$$
$$1$$
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