8.594103
    46/5
    90.234
    90.23456789
    67
    134.78
    123/355
    4/7
    0.123
    1456299/81716
    （18/13+61/27）x+390/31+195/10+1=100
    0.02|5305
    0.02|530
    0.025305
    1.2345|67890
    0.6689|7
    x+2lnx
    0.473684
    0.017964
    2.6

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