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對x=n2-m2=(n+m)(n-m)(1≤m<n≤98,m,n為整數)因為n+m與n-m同奇同偶,所以x是奇數或是4的倍數,在1至98共98個自然數中,奇數有49個,能被4整除的數有24個,所以滿足條件的數有49+24=73個.
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