A simple algorithm for 202 * 198 / 199

=(199+3)*198/199
=199*198/199+3*198/199
=198+3*(1-1/199)
=198+3-3/199
=201-3/199
=200 and 196 / 199

Simple calculation: 199 * 201-198 ^ 2

199*201-198^2
=（198+1）×201-198×198
=198×201-198×198+201
=198×（201-198）+201
=198×3+201
=（200-2）×3+201
=600-6+201
=795

Think about it: how can 199 * 197 / 198 be easily calculated

199*197/198
=（198+1）*197/198
=198*197/198+1*197/198
=197+197/198
=197 and 197 / 198

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