x^4+x^2=16^2
    2.533*12x+2.355*2x = 157.012
    2.533*12x+2.355*2x=942.07
    2x+3=6
    （27-3X）X=61
    （27-3x）*x=60
    （510+X）*23000/220/20000=（320+X）*25000/220/14000
    （510+X）*23000/220*20000=（320+X）*25000/220*14000
    a+a^2=80
    （1+x）^5=1.812
    x+15=50
    x-15=50
    ex-e-2x+2=0
    e^x-e-2x+2
    X=（528+316.8+X）*3.5%
    x/(x+4.951)=0.5/6.5
    x=（5280+316.8+x）*3.5%
    xe^x=1
    x（x＋3）=140
    tanx-x=0.0000000784

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