e^(-0.1)
    1/e
    250乘3/5
    250÷3/5
    (166.6/347.2)^2+(230/560)^2
    (420×0.4)/(〖0.4〗^2×3+〖0.29〗^2×3)
    3290000/(0.98×31101)
    2+1/2
    99900589795*645126846107404101865
    2-2^0.98
    3-3^0.98
    0.98*ln300+0.02*ln200
    ln200
    440/50
    sqrt(128^2+160^2)/1.8
    tan30*tan60
    tan30*tan60
    -arctan0.006279917444
    (tanarccos0.84-tanarccos0.90)
    cos20

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