5x²-[x²-2x-2(x²-3x+1)]这道题的解?

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5x²-[x²-2x-2(x²-3x+1)]这道题的解?
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5x²-[x²-2x-2(x²-3x+1)]这道题的解?
5x²-[x²-2x-2(x²-3x+1)]这道题的解?

5x²-[x²-2x-2(x²-3x+1)]这道题的解?
5x²-[x²-2x-2(x²-3x+1)]
=5x²-(x²-2x-2x²+6x-2)
=5x²-(-x²+4x-2)
=5x²+x²-4x+2
=6x²-4x+2