-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
    0.04×1.8+0.4
    308.8-100×（0.26+0.2+0.8）
    90+3×12.1+250×0.73
    29/12×24/11
    29/12×11/24
    7/4+2/3
    1/4+2/3
    2-1/4+2/3
    3/8+1/12

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