若〔AX次方2-2XY+Y次方2〕-〔-AX次方2+BXY+2Y次方2〕=6X次方2-9XY+CY次方2成立,求A.B.C的值

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若〔AX次方2-2XY+Y次方2〕-〔-AX次方2+BXY+2Y次方2〕=6X次方2-9XY+CY次方2成立,求A.B.C的值若〔AX次方2-2XY+Y次方2〕-〔-AX次方2+BXY+2Y次方2〕=

若〔AX次方2-2XY+Y次方2〕-〔-AX次方2+BXY+2Y次方2〕=6X次方2-9XY+CY次方2成立,求A.B.C的值
若〔AX次方2-2XY+Y次方2〕-〔-AX次方2+BXY+2Y次方2〕=6X次方2-9XY+CY次方2成立,求A.B.C的值

若〔AX次方2-2XY+Y次方2〕-〔-AX次方2+BXY+2Y次方2〕=6X次方2-9XY+CY次方2成立,求A.B.C的值
〔AX次方2-2XY+Y次方2〕-〔-AX次方2+BXY+2Y次方2〕
=ax²-2xy+y²+ax²-bxy-2y²
=2ax²-(2+b)xy-y²
=6x²-9xy+cy²
2a=6 2+b=9 c=-1
a=3 b=7 c=-1