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
    1+3+5+7+9+11+13+15+17+19+21+23+25+27+29+31+33+35+37+39+41+43+45+47+49+51+53+55+57+59+61+63+65+67+69+71
    2079.24/(317.42-29.5)=
    2079.24/(280.88-29.5)=
    0.75×1.6×17.4+260=
    0.85×1.6×17.4+250=
    0.75×4.4×17.4+260=
    2079.24/(313.592-29.5)=
    0.7×4.4×17.4+260=
    220.5/2.9=
    46.44×1000000/(0.9×(650-0.096722)×360)=
    64.39×1000000/(0.9×(650-0.096)×360)=

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