8.3/9.4*2.5/4.6
    732066*55555*【4-3.2/0.8】；0.5*【5.2+1.8-5.2+1.8】/【1-0.75】；9434/86
    8125/76；4485/23；7945/88；2134/21；3.8+4.0+4.2+4.4+4.6+4.8+5.0
    382/43；176/66；234/67；885/72
    9+99+999+9999+99999；3.58；1/2*2/6；1/3+3/5；8.888+9.999+11.110；3.54；2/7；2/3-1/2
    985*124；337*853；294*676；775*389；142*257
    9+99+999+9999+99999；12+23+34+45+56+67+78+89+91；98+197+2996+39995+499994+5999993+69999992+799999991；8*12345679011
    tan80
    55884*（1+0.0181）^16=
    55884*（1+0.0181）^6=
    5000*（1+0.0181）^24=
    5000*（1+0.0181）^14=
    (2849.088×10^3)/(0.9124×29807.43)+(1.0×378.31×10^6)/(1.15×4.3×10^6×(1-(0.8×2849.088)/19197.98))
    123456787651+34567890
    tanarccos0.81
    2970.03/2.4=
    577.373×1000000/194400
    221.981×62.424/24=
    (3.3-0.6)^2×(2×2.4+0.6)
    (4-0.6)^2×(2×2.4+0.6)

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