［0.92*（412*20+110*20+745*0+988*0）+4.2*60*（158-6%*745-0%*988）+2.1*（6%*745*0+0*988*0）-335*（6%*745+0*988）］÷［4.2*158+0.92*(412+110+745+988)］
    790/((238.9×10^3)/1256)
    (4×204.7×10^3)/(2×π×50^2 )
    (204.7×10^3)/(50×20)
    (204.7×10^3×9.45×10^3)/(2.06×10^5×2000)
    (204.7×10^3)/2000
    (4×992×4.653+49/2×4.653/2)/(677.93×5.65+49/2×5.65/2)
    5.773-0.063
    (102.7×10^3)/3000
    25.012-(6.555+6.976)/2
    (279.1×10^6)/(0.98×1605112.48×215)
    17.476-(0+11.476)/2
    sqrt(76/25)
    sqrt(76/25)
    (27.8×10^3)/(0.769×2016×215)+(0.85×0.3×10^6)/(1.05×38822.4×(1-(0.8×14.3)/862.72)×215)
    1.294-0.245
    (1403.6×10^3)/(0.669×21200×305)+(0.85×30.3×10^6)/(1.05×1000144.9×(1-(0.8×1089.6)/5850.31)×305)
    9.848-0.756
    8.202-(7.689+6.281)/2
    10.523-(7.763+9.848)/2

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