计算(-x-2y)∧2-(x-y+3)(x+y-3)-(2y-x)(x+3y),
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计算(-x-2y)∧2-(x-y+3)(x+y-3)-(2y-x)(x+3y),
计算(-x-2y)∧2-(x-y+3)(x+y-3)-(2y-x)(x+3y),
计算(-x-2y)∧2-(x-y+3)(x+y-3)-(2y-x)(x+3y),
(-x-2y)^2-(x-y+3)(x+y-3)-(2y-x)(x+3y)
=(x+2y)^2-[x^2-(y-3)^2]+(x-2y)(x+3y)
=x^2+4xy+4y^2-x^2+y^2-6y+9+x^2+y-6y^2
=x^2+4xy-y^2-5y+9
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