Rút gọna)-5x(x-3)(x+3)+(x+1)³-(x-2)³+(x-1)(x²+x+1)b)(x-4)³-2x(x-5)²+(x-4)(x²+4x+16)-(x-3)³c)(x+5)(x²-5x+25)-(x+3)³+(x-2)(x²+2x+4)-(x-1)³giúp mik vs nhé
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