计算:(2x+3y)(-2x-3y)+(3x+2y)(-3x+2y)
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计算:(2x+3y)(-2x-3y)+(3x+2y)(-3x+2y)
计算:(2x+3y)(-2x-3y)+(3x+2y)(-3x+2y)
计算:(2x+3y)(-2x-3y)+(3x+2y)(-3x+2y)
原式=-(2x+3y)的平方+(2y+3x)*(2y-3x)=-4x的平方-18y的平方-12xy+4y的平方
(2x+3y)(-2x-3y)+(3x+2y)(-3x+2y)
=-(2x+3y)²+4y²-9x²
=-4x²-12xy-9y²+4y²-9x²
=-13x²-12xy-5y²
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