计算,(x+3)²-(x-1)(x-2)

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计算,(x+3)²-(x-1)(x-2)

计算,(x+3)²-(x-1)(x-2)
计算,(x+3)²-(x-1)(x-2)

计算,(x+3)²-(x-1)(x-2)
x2+6x+9-x2+3x-2=9x+7

9x+7
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