Bonjour j'aurai besoin d'aide pour des exercices de maths Réduire ces expressions suivantes:
A=−3x−x2+1−5x+2x2−3
B=(2x+3)−(5x−3)
C=x2+(3x2+2)−5
D=−(2x−3)+(−x+6)
E=x+(2x−1)−(3x+21​)
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