3x^3-3x^3-y^2+5y+x^2-5y+y^2等于多少
2个回答
3x^3-3x^3-y^2+5y+x^2-5y+y^2
=3x^3-3x^3-y^2+y^2+5y-5y+x^2
=0+x^2
=x^2
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