Editing TU Wien:Algebra und Diskrete Mathematik UE (diverse)/Übungen SS19/Beispiel 424

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Bei <math>(a+a)^2</math> kriegst du nicht <math>a+a</math> sondern:
<math>(a+a)^2 \Rightarrow (2a)^2 \Rightarrow 4a^2 </math>
und wenn man das Quadrat wegnimmt, dann hat man:
<math>4a^2 = 4a</math> oder <math> a + a + a + a</math>
Man darf das Quadrat wegnehmen, nur bei <math>a^2</math> und nicht bei <math>(a+a)^2</math>

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