计算 2(x²-x+1)-(-2x+3x²)+(1-x)
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计算 2(x²-x+1)-(-2x+3x²)+(1-x)
计算 2(x²-x+1)-(-2x+3x²)+(1-x)
计算 2(x²-x+1)-(-2x+3x²)+(1-x)
2(x^2-x+1)-(-2x+3x^2)+(1-x)
=2x^2-2x+2+2x-3x^2+1-x
=-x^2-x+3
2(x²-x+1)-(-2x+3x²)+(1-x)
=2x²-2x+2+2x-3x²+1-x
=-x²-x+3
=-( x²+x-3)