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a) 4xau carré-(x+1)au carré=0 b) (2x+1)au carré-(x+2)au carré=0 c) (2x-5)(7-x)=x (-2x+4) d) (5x-10)(x-3)-3(xau carré-4)=0 e) (xau carré+1)(4-3x)-(8x-6xau carré)=0

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