2（x+3y)(x-2y)-3(2x+y)(2x-3y)+5(x-2y)(x+2y)计算,

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2（x+3y)(x-2y)-3(2x+y)(2x-3y)+5(x-2y)(x+2y)计算,
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2（x+3y)(x-2y)-3(2x+y)(2x-3y)+5(x-2y)(x+2y)计算,
2（x+3y)(x-2y)-3(2x+y)(2x-3y)+5(x-2y)(x+2y)
计算,

2（x+3y)(x-2y)-3(2x+y)(2x-3y)+5(x-2y)(x+2y)计算,
原式=2(x²+xy-6y²)-3(4x²-4xy-3y²)+5(x²-4y²)
=2x²+2xy-12y²-12x²+12xy+9y²+5x²-20y²
=-5x²+14xy-23y²

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