lg√（100÷0.78^2÷（0.04*0.78^2+1）÷（0.25*0.78^2+1））=-1*lga
    20*lg√（100÷0.78^2÷（0.04*0.78^2+1）÷（0.25*0.78^2+1））=-1*lga
    20*lg√（100÷0.78^2÷（0.04*0.78^2+1）÷（0.25*0.78^2+1））=-lga
    √（100÷w^2÷（0.04*w^2+1）÷（0.25*w^2+1））=1
    √（100÷0.78^2÷（0.04*0.78^2+1）÷（0.25*0.78^2+1））=1/a
    0.5+0.5*8*x+0.5*16*x*x=1
    √（10^2÷0.78^2÷（（0.04）*0.78^2+1）÷（（0.25）*0.78^2+1））=1/a
    0.2+0.2*8*x+0.2*16*x*x=1
    0.5×lg（10^2÷0.78^2÷（（0.04）*0.78^2+1）÷（（0.25）*0.78^2+1））=-lga
    0.1+0.1*8*x+0.1*16*x*x=1
    lg√（10^2÷0.78^2÷（（0.04）*0.78^2+1）÷（（0.25）*0.78^2+1））=-lga
    0.1+0.1*8*0.5*x+0.1*16*0.5*x*x=1
    2-6x^4-10x^6=0
    （x-200）/200=-5.01%
    0.1+0.1*8*0.5*(cos(x)+1)+0.1*16*0.5*(cos(2*x)+1)=1
    0.2+0.2*8*0.2*(cos(x)+1)+0.3*16*0.2*(cos(2*x)+1)=1
    0.3+0.3*8*0.5*(cos(x)+1)+0.3*16*0.5*(cos(2*x)+1)=1
    √（10^2÷0.78^2÷（（0.04）*0.78^2+1）÷（（0.25）*0.78^2+1））=1÷a
    0.2+0.2*8*0.5*(cos(x)+1)+0.2*16*0.5*(cos(2*x)+1)=1
    0.2+0.2*8*(cos(x)+1)+0.2*16*(cos(2*x)+1)=1

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