合并同类项3xy-5yx
5yx-3x²y-7xy²+6xy-12xy+7xy²+8x²y5yx-3x²y-7xy²+6xy-12xy+...
5yx-3x²y-7xy²+6xy-12xy+7xy²+8x²y
5yx-3x²y-7xy²+6xy-12xy+7xy²+8x²y
合并同类项 展开
5yx-3x²y-7xy²+6xy-12xy+7xy²+8x²y
合并同类项 展开
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