(5x3+3x-12)-(2x3-6x+17)=______

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问题  (5x3+3x-12)-(2x3-6x+17)=______

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答案 To add or subtract polynomials, combine like terms (remember to keep track of the negative signs!): (5x3+3x-12)-(2x3-6x+17) (5x3-2x3)+(3x+6x)-(17-12) 3x3+9x-5

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