1: \(A=3\left(x^2-2x+1\right)-x^2-2x-1+2x^2-18-\left(2x+3\right)^2+20x-5\)
\(=3x^2-6x+3+x^2+18x-24-4x^2-12x-9\)
=3-24-9=-30
2: \(B=5x\left(x^2-49\right)-x\left(4x^2-4x+1\right)-x^3-4x^2+246x-175\)
\(=5x^3-245x-4x^3+4x^2-x-x^3-4x^2+246x-175\)
=-175
3: \(C=-2x\left(9x^2+12x+4\right)+16x^2+8x+1+2x^3+22x-4-5+x\)
\(=-18x^3-24x^2-8x+2x^3+16x^2+31x-8\)
=-16x^3-8x^2+23x-8
4:
\(=25x^2-20x+4-36x^2-12x-1+11x^2-44-16\left(3-2x\right)\)
\(=-32x-41-48+32x=-89\)
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