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求11/2x^2-29x+10y与5/2x^2+13x-5y的2倍的差
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求11/2x^2-29x+10y与5/2x^2+13x-5y的2倍的差
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求11/2x^2-29x+10y与5/2x^2+13x-5y的2倍的差
=11/2x^2-29x+10y-2*(5/2x^2+13x-5y)
=11/2x^2-29x+10y-10/2x^2-26x+10y
=1/2x^2-55x+20y
=11/2x^2-29x+10y-2*(5/2x^2+13x-5y)
=11/2x^2-29x+10y-10/2x^2-26x+10y
=1/2x^2-55x+20y
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