合并同类项.要写清楚.5yx-3x²y-7xy²+6xy-12xy+7xy²+8x²y
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合并同类项.要写清楚.5yx-3x²y-7xy²+6xy-12xy+7xy²+8x²y
合并同类项.要写清楚.
5yx-3x²y-7xy²+6xy-12xy+7xy²+8x²y
合并同类项.要写清楚.5yx-3x²y-7xy²+6xy-12xy+7xy²+8x²y
5yx-3x²y-7xy²+6xy-12xy+7xy²+8x²y
=(5+6-12)xy+(-3+8)x²y+(-7+7)xy²
=-xy+5x²y
5yx-3x²y-7xy²+6xy-12xy+7xy²+8x²y
=﹙5xy+6xy-12xy﹚+﹙8x²y-3x²y﹚+﹙7x²y-7x²y﹚
=﹣xy+5x²y.