\(a,\left(x^3-3x-2\right):\left(x-2\right)\\ =\left(x-2\right)\left(x+1\right)^2:\left(x-2\right)=\left(x+1\right)^2\\ b,\left(6x^3-x^2-26x+21\right):\left(2x-3\right)\\ =\left(2x-3\right)\left(3x^2+4x-7\right):\left(2x-3\right)=3x^2+4x-7\\ c,\left(5x^2-3x^3+15-9x\right):\left(5-3x\right)\\ =\left(5-3x\right)\left(x^2+3\right):\left(5-3x\right)=x^2+3\\ d,\left(x^3+6x^2+8x-3\right):\left(x^2+3x-1\right)\\ =\left(x^2+3x-1\right)\left(x+3\right):\left(x^2+3x-1\right)=x+3\)
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