(3x+2y)(4x-5y)-12(x+y)(x-y)+7xy,其中x=2011,y=-1,
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(3x+2y)(4x-5y)-12(x+y)(x-y)+7xy,其中x=2011,y=-1,(3x+2y)(4x-5y)-12(x+y)(x-y)+7xy,其中x=2011,y=-1,(3x+2y)(
(3x+2y)(4x-5y)-12(x+y)(x-y)+7xy,其中x=2011,y=-1,
(3x+2y)(4x-5y)-12(x+y)(x-y)+7xy,其中x=2011,y=-1,
(3x+2y)(4x-5y)-12(x+y)(x-y)+7xy,其中x=2011,y=-1,
(3x+2y)(4x-5y)-12(x+y)(x-y)+7xy
= (12x^2-7xy-10y^2)-12(x^2-y^2)+7xy
= 12x^2-7xy-10y^2-12x^2+12y^2+7xy
= -10y^2+12y^2
= 2y^2
= 2*(-1)^2
= 2
化简的2y^2
原式=2
先化简,然后代入数据
(3x+2y)(4x-5y)-12(x+y)(x-y)+7xy
=12x²+8xy-15xy-10y²-12x²+12y²+7xy
=2y²=2
(3x+2y)(4x-5y)-12(x+y)(x-y)+7xy
=12x^2-15xy+8xy-10y^2-12x^2+12y^2+7xy
=2y^2=2(-1)^2=2
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