3Q^2-31Q-60=0
    x+20<1/2+4
    ln(x)=-0.57
    (10x^2-6x)/(sqrt((-1-x)^2+(3x-1)^2)*sqrt((1-x)^2+(3x-1)^2))=-sqrt(2)/2
    xx-8x+6=0
    8.442+52.03x = 93.62+1157x*(1-0.55x/0.95)+0.484x+(0.2475xx)/(1-0.05)*4.18/32
    8（6-x）=2√7*x
    8.442+52.03x = 93.62+1157x*(1-x)/(1-0.05)+0.484x+(0.2475xx)/(1-0.05)*4.18/32
    8/x=2√7/6-x
    8.442+52.03x = 93.62+1157x*(1-x)/(1-0.45x)+0.484x+(0.2475xx)/(1-0.05)*4.18/32
    9*3.1415926*3.1415926*A^（4）-400*A^(2)+400=0
    3/2=3/x
    x-2/3
    3/2
    10+(2400-10x)/(x+30)=2400/x-2
    90+arctan(7.5/2.13)-arctan(7.5/1)-arctan(7.5/26.4)
    （y＋23）/（4＋32）=2/3
    (14/9)^x-(31/20)
    3x+0.7=21.7
    2.2x-1.6=9.4

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