0.0286*78+(1-0.0286)*92
    0.06415*78+(1-0.06415)*92
    10^2.02159636
    0.6769(0.0286)^3 - 1.8435(0.0286)^2 + 2.1694(0.0286) + 0.0036
    (81.276+88.346)/2
    (79.568+85.612)/2
    0.261*78+(1-0.261)*92
    0.4563*78+(1-0.4563)*92
    0.6769(0.261)^3 - 1.8435(0.261)^2 + 2.1694(0.261) + 0.0036
    0.766*78+(1-0.766)*92
    0.888*78+(1-0.888)*92
    0.5*3.770*（240*15-1294）+0.7*0.8*1.131*{550+6*（10*15-9.8/15+2）*（15+2-3）}
    3342.48+7.26*12
    3342.48+7.26*12
    12+4√3
    8-8√3
    16√3-32
    [1-(12/12.0625)^(30*12)]*20688.1*12/0.0625
    18÷80%÷2/3
    18÷80%÷3/2

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