（20-6x）(12-2x)＝96
    （20-x）(12-3x)＝96
    （50-x/5）(200+x)＝10125
    (20+2x)(40-x)=1300
    (20+2x)(40-x)=1200
     a×a-5a+3=0
     x*x-5x+3=0
    -a*a+7/2a=3/2
    2x + 5 = 11
    （x-1）/（x+1）=0.62
    3.2/50=x/196710+（（x-1306）/7371.83）^2
    45.57+11.86y=33.05y+111.89
    112.60+11.86y=33.05y+111.89
    11.63*3.14*0.5(x-20)= (2*3.14*0.1185*(417.44-x))/0.5108
    -x=lg(6.15^-0.5*10^-11)
    -x=lg(1.76*10^-5)
    -x=lg(3.52^-0.5*10^-11)
    -x=lg(3.53^-1*10^-10)
    11.63*3.14*0.4(x-20)=(2*3.14*0.1185*(417.44-x))/0.28768
    11.63*3.14*0.65(x-20)=(2*3.14*0.1185*(417.44-x))/0.167

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