计算.﹙2x+3y﹚﹙2x-3y﹚-﹙x+2y﹚﹙x-2y﹚.[﹙2x+y﹚²-﹙2x+y﹚﹙2x-y﹚]÷2x-y.
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计算.﹙2x+3y﹚﹙2x-3y﹚-﹙x+2y﹚﹙x-2y﹚.[﹙2x+y﹚²-﹙2x+y﹚﹙2x-y﹚]÷2x-y.计算.﹙2x+3y﹚﹙2x-3y﹚-﹙x+2y﹚﹙x-2y﹚.[﹙2x+
计算.﹙2x+3y﹚﹙2x-3y﹚-﹙x+2y﹚﹙x-2y﹚.[﹙2x+y﹚²-﹙2x+y﹚﹙2x-y﹚]÷2x-y.
计算.﹙2x+3y﹚﹙2x-3y﹚-﹙x+2y﹚﹙x-2y﹚.
[﹙2x+y﹚²-﹙2x+y﹚﹙2x-y﹚]÷2x-y.
计算.﹙2x+3y﹚﹙2x-3y﹚-﹙x+2y﹚﹙x-2y﹚.[﹙2x+y﹚²-﹙2x+y﹚﹙2x-y﹚]÷2x-y.
﹙2x+3y﹚﹙2x-3y﹚-﹙x+2y﹚﹙x-2y﹚.
=4X²-9y²-x²+4y²
=3x²-5y²
[﹙2x+y﹚²-﹙2x+y﹚﹙2x-y﹚]÷(2x-y)
=(4x²+4xy+y²-4x²+y²)÷(2x-y)
=(4xy+2y²)/(2x-y)
1原式=4x²-9y²-x²+4y²
=3x²-5y²
(=(√3x+√5y)(√3x-√5y))
2原式=(2x+y)(2x+y-2x+y)/2x-y
=2y(2x+y)/2x-y
=y+y²/2x-y
=y²/2x
计算.﹙2x+3y﹚﹙2x-3y﹚-﹙x+2y﹚﹙x-2y﹚.[﹙2x+y﹚²-﹙2x+y﹚﹙2x-y﹚]÷2x-y.
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