作业帮计算:(2x-3y)^2-(y+3x)(3x-y)
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计算:(2x-3y)^2-(y+3x)(3x-y)
计算:(2x-3y)^2-(y+3x)(3x-y)
计算:(2x-3y)^2-(y+3x)(3x-y)
原式=4x^2-12xy+9y^2-(9x^2-y^2)
=4x^2-12xy+9y^2-9x^2+y^2
=4x^2+y^2-12xy
(2x-3y)^2-(y+3x)(3x-y)
=4x^2-12xy+9y^2-9x^2+y^2
=-5x^2-12xy+10y^2
(2x-3y)^2-(y+3x)(3x-y)
=（4x^2-12xy+9y^2）-（9x^2-y^2）
=4x^2-12xy+9y^2-9x^2+y^2
=10y^2-12xy-5x^2
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