400:2*30
    400^2*30
    6/11-1/2+5/11
    1/4+1/2+1/4
    1-1/3-1/3
    arcsin0.371644213
    arcsin0.3567
    (11-3*(1/5))/2
    1199773683/396500
    sqrt（729）
    6.912-0.00187*2998.303
    7.336-0.0098*3063.908
    ((11-3*(1/5)/2)
    (1-((1/2)/(3/2)-1))*(9/16)+(7/2)*(-1/8)
    6896.5/144
    34482.5/8177.08
    6896.5*5
    144*117+3*8177
    (4*3.14/3)(12.5)^3
    (4*3.14/3)(3.25)^3

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