3x-2xy-8-2x+6xy-x²+6、-x²+2xy-y²-3x²-2xy+2y²合并同类项
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![3x-2xy-8-2x+6xy-x²+6、-x²+2xy-y²-3x²-2xy+2y²合并同类项](/uploads/image/z/1997752-40-2.jpg?t=3x-2xy-8-2x%2B6xy-x%26%23178%3B%2B6%E3%80%81-x%26%23178%3B%2B2xy-y%26%23178%3B-3x%26%23178%3B-2xy%2B2y%26%23178%3B%E5%90%88%E5%B9%B6%E5%90%8C%E7%B1%BB%E9%A1%B9)
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3x-2xy-8-2x+6xy-x²+6、-x²+2xy-y²-3x²-2xy+2y²合并同类项
3x-2xy-8-2x+6xy-x²+6、-x²+2xy-y²-3x²-2xy+2y²合并同类项
3x-2xy-8-2x+6xy-x²+6、-x²+2xy-y²-3x²-2xy+2y²合并同类项
3x-2xy-8-2x+6xy-x²+6
=-x²+(-2+6)xy+(3-2)x+(-8+6)
=-x²+4xy+x-2
-x²+2xy-y²-3x²-2xy+2y²
=(-1-3)x²+(2-2)xy+(-1+2)y²
=-4x²+y²
3x-2xy-8-2x+6xy-x²+6
=3x-2x-2xy+6xy-8+6-x²
=-x+4xy-2-x²
-x²+2xy-y²-3x²-2xy+2y²
=-x²-3x²+2xy-2xy-y²+2y²
=-4x²+y²