（41.789+x）×1.55＝72.378+41.789－x
    （41.789+x）×1.45＝72.378+41.789－x
    （41.789+x）×1.35＝72.378+41.789－x
    （41.789+x）×1.25＝72.378+41.789－x
    （41.789+x）×1.15＝72.378+41.789－x
    √x＋1×（1＋x）
    6*s+1.15*s^2-5.75=0
    cosx-cosx*cosx
    A+A*13%=6948000
    s^4+4*s^2+9=0
    x+1/(x+2)=7/24
    x+1/(x+2)=8/15
    x+1/(x+1)=7/12
    x+1/x=65/8
    x+1/x=13/6
    x-x/1.17*0.09=94.81
    x-x/1+17%*9%=94.81
    4*s^2-4*s^4=0.51
    4*s^2-4*s^4=0.51
    x+x^2+x^3+x^4+x^5+x^6=27000

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