求数学学霸，急，过程
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3x-(2x^2-4x+1)+(3x^2-2x)
=3x-2x^2+4x-1+3x^2-2x
=x^2+5x+1
(a-1)(a+1)(a^2-1)
=(a^2-1)(a^2-1)
=a^4-2a^2+1
[(3x-2y)^2]^3*[(2y-3x)^3]^5
=(3x-2y)^6*(2y-3x)^15
=(2y-3x)^6*(2y-3x)^15
=(2y-3x)^21
(2x-4)(-1/2x^2+2x-4)
=2*(x-2)(-1/2x^2+2x-4)
=(x-2)(-x^2+4x-8)
=-(x-2)(x^2-4x+8)
=-(x-2)(x^2-4x+4+4)
=-(x-2)[(x-2)^2+4]
=-(x-2)^3-4(x-2)
=(2-x)^3-4(x-2)
=3x-2x^2+4x-1+3x^2-2x
=x^2+5x+1
(a-1)(a+1)(a^2-1)
=(a^2-1)(a^2-1)
=a^4-2a^2+1
[(3x-2y)^2]^3*[(2y-3x)^3]^5
=(3x-2y)^6*(2y-3x)^15
=(2y-3x)^6*(2y-3x)^15
=(2y-3x)^21
(2x-4)(-1/2x^2+2x-4)
=2*(x-2)(-1/2x^2+2x-4)
=(x-2)(-x^2+4x-8)
=-(x-2)(x^2-4x+8)
=-(x-2)(x^2-4x+4+4)
=-(x-2)[(x-2)^2+4]
=-(x-2)^3-4(x-2)
=(2-x)^3-4(x-2)
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