6xy-3(3y²-(x²-2xy)+1) =
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/31 09:29:38
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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
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来源:学生作业帮助网 编辑:作业帮 时间:2024/07/31 09:29:38
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