计算(3x+y-2)(4x-y+2)
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计算(3x+y-2)(4x-y+2)计算(3x+y-2)(4x-y+2)计算(3x+y-2)(4x-y+2)=12x^2-3xy+6x+4xy-y^2+2y-8x+2y-4=12x^2-y^2+xy-
计算(3x+y-2)(4x-y+2)
计算(3x+y-2)(4x-y+2)
计算(3x+y-2)(4x-y+2)
=12x^2-3xy+6x+4xy-y^2+2y-8x+2y-4
=12x^2-y^2+xy-2x+4y-4
12*x^2+x*y-2*x-y^2+4*y-4
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