115=0.81x+20*lgx
    t^2+3600＝240t
    115=25800x+20*lgx
    115=0.81x+20*lgx
    115=.081x+lgx
    115=25800x+20lgx
    x=x*0.05+30655
    X*0.05-X=-3654.8
    0.8(10+2.4x＋0.8(x－10)＋0.4×(x╱40)×60)－(14＋2.2(x－3)＋1(x－10))＝1.8
    0.8(10+2.4x＋0.8(x－10)＋0.4×x╱40×60)－(14＋2.2(x－3)＋1(x－10))＝1.8
    0.8(10+2.4x＋0.8(x－10)＋0.4×x╱40×60)－(14＋2.2(x－3)＋1(x－10))
    -5t^2+12t-11.9=0
    s^4+6s^3+13s^2+10s+6.5=0
    0.04*x^6+1.04*x^4＋x^2-64
    -（4）^x
    a^2-(-a^4+10a^2-9)^0.5=5-4√2
    a^2-(-a^4+10a^2-9)^0.5=5-4√2
    a^2-(-a^4+10a^2-9)^0.5=5-4√2
    a^2-(-a^4+10a^2-9)^0.5=5+4√2
    a^4-(10+4√2)a^2+33+20√2=0

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