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)
    -20lg(0.075968)
    1600(1+4.8*4.8*8.71^2)/8.71^2/((0.04*8.71^2+1)+(0.0625^2*8.71^2+1)+(80^2*8.71^2+1))
    1600(1+4.8*4.8*8.71^2)/x/((0.04*8.71^2+1)+(0.0625^2*8.71^2+1)+(80^2*8.71^2+1))
    90-arctan(0.2*2.19)-arctan(0.0625*2.19)+arctan(4.8*2.19)-arctan(80*2.19)
    （7.12*2100+3.12*X）/(2100+X)=3.12
    2X/1-X^2
    2574.206172/3600
    10.212*234.87×(273+20)/273
    10.212*234.87
    213.4-100×（0.26+0.2+0.8
    90+3×1.8+250×0.472

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