e^x+e^（-x）=（e+1）^2/2e
    100/x+100/(x+50)+76/(72+x)＝1.5
    100/x+100/(x+50)+76/(72+x)
    20%x+x=677.4
    20%x+x=207.6396
    20%x+x=120.624
    20%x+x=626.1984
    20%x+x=626.20
    10%x+x=11.21
    10%x+x=206.15
    s^3+2*s^2+6*s+12=0
    s^3+6*s^2+6*s+12=0
    (ex+e-x)/2
    cosx=-0.45418
    x^3+6*x^2+18*x+20=0
    x^3+6*x+18*x+20=0
    1.792*exp(-y/74.6)
    x+13%x=42
    x+18%x=42
    x+16%x=42

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