12,12,12,13,14,14,15,16,16,16,16,16,16,17,17,17,17,17,18,18,18,18,18,19,19,19,20,20,21
    34,55,23
    1 100 2 200 3 400 4 800 5 1600
    2,8,9,7,1,6,4,5,3,8
    4,5,6,2,7,9,8,3
    12，13，14，10，13，14，11
    1,27，894，849，99,100,957,999,35,77
    664
    572
    5
    7,8,9,7,4,
    4.16÷12.5÷0.32
    3.15÷12.5÷0.24
    12,12,23,54,890
    12,12,23
    1,2,3,2,2,1,4,5,5,5,33,2,
    321
    yyyy
    2,2,3,4,1,2,3,4
    1,1,2,3,5,8,13,21

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