化简-x^2-{3x-[2x^2(1-3x)]}如题

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化简-x^2-{3x-[2x^2(1-3x)]}
如题

-x^2-{3x-[2x^2(1-3x)]}
=-x^2-{3x-[2x^2-6x^3]}
=-x^2-{3x-2x^2+6x^3}
=-x^2-3x+2x^2-6x^3
=-3x+x^2-6x^3