计算:(3x+4y)(3x-4y)-5(x+y)(x-2y)
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计算:(3x+4y)(3x-4y)-5(x+y)(x-2y)
计算:(3x+4y)(3x-4y)-5(x+y)(x-2y)
计算:(3x+4y)(3x-4y)-5(x+y)(x-2y)
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