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2014-11-03T19:14:06+02:00
2014-11-03T19:17:16+02:00
X²-5=11 ⇒ x²-5-11=0 ⇒ x²-16=0 ⇒ x²=16 ⇒ x= ⁺₋ √16 ⇒x=⁺₋ 4...
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