1500（50-x）+2500x = 90000
    1500（50-x）+2500x=9000
    lnx=0
    lnx=0.5
    lnx=0.5x
    3x^2-x-1
    3.14*(x+49.5)/10*3.14*(x/10/2)*(x/10/2)*19.32=40.23
    3.14*(x+49.5)/10*2*3.14*(x/10/2)*(x/10/2)*19.32=40.23
    547*x^2-25*x-572=0
    547*x-25*x-572=0
    2lnx-x^2+4x-3=0
    2lnx-x^2+4x-3
    x（lnx-4）＝e^8
    e^x*x=e^4
    1/6(x-4)-2(4-x)=7/2(x-4)-4
    e^x*x^2+lnx = 0
    1/3(X-4)=3-2/3(x-4)
    xx*1/4xx
    x*x*1/2x*1/2x
    0.3x-0.1/0.2－2x+9/3=-6

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