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分母是1----分母是49的分数共有:
1+2+3+4+…+49,
=(1+49)×49÷2,
=1225;
1225+13=1238;
故答案为:1238.
1+2+3+4+…+49,
=(1+49)×49÷2,
=1225;
1225+13=1238;
故答案为:1238.
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