2(x-3)(-x+1)怎么做

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2(x-3)(-x+1)怎么做
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2(x-3)(-x+1)怎么做
2(x-3)(-x+1)怎么做

2(x-3)(-x+1)怎么做
2(x-3)(-x+1)
=2(-x²+x+3x-3)
=2(-x²+4x-3)
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2(x-3)(-x+1)
=2(-x²+x+3x-3)
=-2x²+8x-6;

2(x-3)(-x+1)
=-x[2(x-3)]+2(x-3)
=-2x(x-3)+2x-6
=-2x²+6x+2x-6
=2x²+8x-6
=2(-x²+4x-3)
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