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∵(m2-1)2+(2m)2=m4-2m2+1+4m2=m4+2m2+1,(m2+1)2=m4+2m2+1,∴(m2-1)2+(2m)2=(m2+1)2,∴此三角形是直角三角形,最大角的度數為90°.故答案為:90°.
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