(25-9x^2)^0.5+（25-x^2）^0.5=4x
    （3400*9000+5000*x）/（9000+x）=4000
    x=-lnx
    (0.074*sin(x)/cos(x-5)+0.01*(1+sin(x)))=1
    0.074*sin(x)/cos(x-5)+0.01*(1+sin(x)) =1
    0.1922^2=2/x-2/x^2*(1-e^(-x))
    0.1922^2=2/x-2/x^2*(1-e^(-x))
    0.1922^2=2/x-2/x^2*(1-e^(-x))
    2x=-lnx
    200000-x=20%x
    200000-X=200000-X*20%
    0.7305^2=2/x-2/x^2*(1-e^(-x))
    x=-lnx
    244＝275×（1－x）
    122＝275×（1－x%）÷2
    20%X+X=12000
    30%X+X=12000
    20%X+X=12000
    20%X=12000
    20%X

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