(0.5*10-3)*1.39*180*11967
    13.8*1620*80.2*(1197-40.1）
    330*(4926+402)
    (4926*(50+1.5*31.6)+402*(50+3.5*31.6+18.4/2))/(4926+402)
    41652÷534
    534×78
    (5851.87-3776.61)(1+0.1)^-1
    (1+0.08)^-1
    (1093.51-x)/x=-0.0327
    sinx＝3/25
    1.44x-x=6000
    90+arctan(4.1*2.45)-arctan(0.25*2.45)-arctan(0.0625*2.45)-arctan(7.07*2.45)
    1/(5/2.44/((0.0625^2*2.44^2+1)*(0.25^2*2.44^2+1))^0.5)
    90-arctan(0.25*3.62)-arctan(0.0625*3.62)
    (25/5^2/((5^2+1)*(0.25^2*5^2+1)))^0.5
    (25/3^2/((3^2+1)*(0.25^2*3^2+1)))^0.5
    10/[2.5-x+x（4x-5+2x）/(6x+4x-5+2x)]=8
    90+arctan(0.6*19.2)-arctan(0.25*0.6)-arctan(0.6)-arctan(160*0.6)
    1/8.459745
    5/0.52/(((0.52^2+1)*(0.25^2*0.52^2+1))^0.5)

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