化简:2x^2-3[2x-2(-x^2+2x-1)].
1个回答
2x^2-3[2x-2(-x^2+2x-1)-4]
=2x^2-3[2x+2x^2-4x+2-4]
=2x^2-3[2x^2-2x-2]
=2x^2-6x^2+6x+6
=-4x^2+6x+6
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