问题标题:
问几道数学题,3(x²-y²)-4(2x²-3y²)怎么做?
问题描述:

问几道数学题,3(x²-y²)-4(2x²-3y²)怎么做?

舒志忠回答:
  3(x²-y²)-4(2x²-3y²)   =3x²-3y²-8x²+12y²   =-5x²+9y²
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