下列叙述中，正确的有①如果2x=a，2y=b，那么2x﹣y=a﹣b；②满足条件的n不存在；③任意一个三角形的三条高所在的直线相交于一点，且这点一定在三角形的内部；④△ABC中，若∠A+∠B=2∠-七年

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