e^4/（e^(-1)+e^(-2)）
    1×4÷2+((4+25/4)*3/2)/2+(5/2)*(25/4)/2
    179*345
    156*177
    44*46
    1000÷5.178
    1000÷3.387
    1000÷3.915
    1000÷3.535
    1000÷5.269
    e*e
    -2×1＝
    -2－1＝
    1000÷3.345
    1000÷5.291
    1000÷3.424
    1000÷5.284
    (asin(198/200))/68.832
    arccos(0.1)/62.832
    (asin(0.9))/62.832

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