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bonjour, A = x²-(9+6x+x²) = x²-9-6x-x² = -9-6x = 3(-3-2x) B = a²-4a+4-(a²-8a+16) = a²-4a+4-a²+8a-16 = 4a-12 = 4(a-3) C = 4b²+6b+1+4+4b+b² = 5b²+10b+5 = 5(b²+2b+1) D = 3u-3√2-2u²+2u√2 = -2u²-3√2+2u√2+3u E = (x²+2x+x+2)(x+3) = (x²+3x+2)(x+3) = x^3+3x²+3x²+9x+2x+6 = x^3+6x²+11x+6
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