6xy-3(3y²-(x²-2xy)+1) =

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6xy-3(3y²-(x²-2xy)+1) =

6xy-3(3y²-(x²-2xy)+1) =
6xy-3(3y²-(x²-2xy)+1) =

6xy-3(3y²-(x²-2xy)+1) =
原式=6xy-9y²+3(x²-2xy)-3
=6xy-9y²+3x²-6xy-3
=3x²-9y²-3