(x^3十3x^2-5x十6)-(2x^2-5x十1)-(x^3十x^2-2)
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(x^3十3x^2-5x十6)-(2x^2-5x十1)-(x^3十x^2-2)
=x^3十3x^2-5x十6-2x^2+5x-1-x^3-x^2+2
=7
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