x²-3xy-3x²y²+2yx²-y²x 合并同类项
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![x²-3xy-3x²y²+2yx²-y²x 合并同类项](/uploads/image/z/989372-20-2.jpg?t=x%26%23178%3B-3xy-3x%26%23178%3By%26%23178%3B%2B2yx%26%23178%3B-y%26%23178%3Bx+%E5%90%88%E5%B9%B6%E5%90%8C%E7%B1%BB%E9%A1%B9)
x²-3xy-3x²y²+2yx²-y²x 合并同类项
x²-3xy-3x²y²+2yx²-y²x 合并同类项
x²-3xy-3x²y²+2yx²-y²x 合并同类项
x²-3xy-3x²y²+2yx²-y²x 合并同类项
=x²-3xy-3x²y²+2yx²-y²x;
不能合并了
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