10*22+3600000/1200000*120+2160000/1200000*120
    850*（2.4-0.85-0.15）+1680*（1.2-0.85-0.05）+1740*（8-2.8-0.4）-3700
    500*（2.4-0.85-0.15）+1500*（1.2-0.85-0.05）+1500*（8-2.8-0.4）-3700
    (23÷54-7÷2×7÷9+2)^2+(2×sqrt(2)×23÷54-sqrt(2)×7÷9)^2+(2×7÷9-2)^2
    (23÷54-7÷2×7÷9+2)^2+(2×sqrt(2)×23÷54-sqrt(2)×7÷9)^2+(2×7÷9-2)^2
    arctan0.5
    arctan1
    arctan1
    log(10,0.00000000012499999646475857)
    log(10,10)
    log(10,1.2499999646475857*10^-10)
    log(10,9.999999752772727^-6)
    log(10,10^-6)
    √((69.95/1)^2+〖36.34〗^2 )
    (395.9×1000)/(0.7×10×1556)
    (59.38×1000×1000)/848776
    (59.38×1000×1000)/848776
    (59.38×1000×1000)/2178039
    √(〖35.64〗^2+3×〖50.71〗^2 )
    (395.9×1000×594918)/(193498783×2×12)

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