(5*((4/1.4373)^(0.4/1.4)-1))^0.5
    (5*((4/0.4373)^(0.4/1.4)-1))^0.5
    (5*((4/0.55)^(0.4/1.4)-1))^0.5
    (5*((4/1.55)^(0.4/1.4)-1))^0.5
    90-18
    atanacos0.5
    lge(acos(-1)sqrt163
    e(acos(-1)sqrt163
    (1/3)*((1+0.2*3^2)*(2/2.4))^(2.4/0.8)
    -2-（-2）
    4-10
    0-4
    -2-0
    -2-(-2)
    654984651468365418461321897123321234454649684798*18798165898465645411455466954948816141161698747
    999999999999999999999984444444444444*1111111115666666666664465456456456
    12345679*81
    9^6/7
    √（2522）
    -4*-4

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