5x^2+2.7368*x+0.61x^2=2.31
    K=1004+20.08+0.01K+22.75+0.0002K+52.34+0.0005K+0.0533K
    K=1161.5+23.23+0.01K+26.37+0.0002K+60.56+0.0005K+0.0533K
    2/x＋1
    X^2+X-6=0
    2x^3+x^2=1
    sin（1/x）
    -X＋(X/3)
    sqrt((sqrt(4-x^2)/2)^2+(sqrt(4-x^2)+x/2)^2)=1+sqrt(2)
    sqrt((sqrt(4-x^2)/2)^2+(sqrt(4-x^2)+x/2)^2)=1+sqrt(2)
    80xx-x-40=0
    tanx²/cosx
    1/ex
    -5x^2+44x-96
    2s^3+11s^2+20s+10=0
    s^3+6s^2+9s+54=0
    s^2+2s+1=0
    20-4p=2+6p
    2s^3+11s^2+20s+10=0
    12.1x=（3.5+x）×7.96

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