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1227

Centuries: 12th century - 13th century - 14th century

Decades: 1170s 1180s 1190s 1200s 1210s - 1220s - 1230s 1240s 1250s 1260s 1270s

Years: 1222 1223 1224 1225 1226 - 1227 - 1228 1229 1230 1231 1232

Events

Births

Deaths

Death of Genghis Khan

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Quadratic formula

... a perfect square; it is the square of (x + b/(2a)). The right side can be written as a single fraction; the common denominator is 4a2. W ...

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