√(0.8^2+2.8^2)
    √0.8^2+2.8^2
    √(3-1)
    114514+1919810
    85.5/1.22+85.5/(1.22^2)+85.5/(1.22^3)+85.5/(1.22^4)
    sin(5)
    sin(90)
    124+233
    asin0.25
    1*3*5*7*9*11*13*14
    (0.9×(650-0.096)×360)
    1011121314151617181889888786858483828181÷99999999999999999999
    12345679012345679012345679012345679×81；24691358024691358024691358024691358×81
    20×0+40×0.03+60×0.06+80×0.09+100×0.12+120×0.15
    2 7 × 1 5
    11×23125；11×40121；11×63036；11×82153
    649÷7；813÷9；245÷7；600÷11
    3 6 ÷ 1 2
    12345679 012345679012345679012345679×81
    (3/14+5/21)÷1/7

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