22.计算x(3x^2+2x+2)-x^2(3x+2)
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22.计算x(3x^2+2x+2)-x^2(3x+2)
22.计算x(3x^2+2x+2)-x^2(3x+2)
22.计算x(3x^2+2x+2)-x^2(3x+2)
x(3x^2+2x+2)-x^2(3x+2)
=3x³+2x²+2x-3x³-2x²
=2x
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