计算 x(x+3)-(x-1)(x-2)
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计算 x(x+3)-(x-1)(x-2)
计算 x(x+3)-(x-1)(x-2)
计算 x(x+3)-(x-1)(x-2)
=x²+3x-(x²-3x+2)
=x²+3x-x²+3x-2
=6x-2
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