计算:(3x^2-2y^2)-(-x^2+2xy+y^2)-(x^2-4xy+3y^2)

问题描述:

计算:(3x^2-2y^2)-(-x^2+2xy+y^2)-(x^2-4xy+3y^2)

(3x^2-2y^2)-(-x^2+2xy+y^2)-(x^2-4xy+3y^2)
=3x²-2y+x²-2xy-y²-x²+4xy-3y²
=3x²+2xy-6y²