1: \(=\left(6x+1-6x+1\right)^2=2^2=4\)
2: \(=3x^2-6x-5x+5x^2-8x^2+24=-11x+24\)
3: \(=x^3-8-x^3+3x^2-3x+1+7=3x^2-3x\)
4: \(=x\left(x^2-4\right)+x^3+27=x^3-4x+x^3+27=2x^3-4x+27\)
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