100乘0.5+（x-100）乘0.6=0.6x
    172.1598-0.01511x=165.6899+(x-11.2)/4
    -4xxx+240xx-2200x+4000
    172.1598+0.01511x=164.9699+(x-11.2)/4
    172.1598+0.102379x=164.9699+(x-11.2)/4
    clear
    168.9541+0.102379x=163.5528+(x-11.2)/4
    168.9541-0.102379x=164.2728+(x-11.2)/4
    x^4-10x^3+32x^2-35x+7=0
    （3500-50a)*240(1+a/50)+3000*(1-a/40)*360(1+a/30)=1944000
    8842*330+500*（1300-x） = （128*x/(1300-x)+(x-60)*128/(1300-x)）/2*60*1400+0.5*100*128*x*x/(1300-x)
    a-sin(a)*cos(a)=0.0785
    164.4192-0.08276x=162.5856+(x-11.2)/4
    164.4192+0.08276x=161.8656+(x-11.2)/4
    （3500-20a)*240(1+a%)+3000{1-(a/2)%}*360*{1+{2/9*a+20)%}=2067600
    （3500-20a)*240(1+a%)+3000{1-(a/2)%}*360*{1+{2/9+20)%}=2067600
    a-sin(a)*cos(a)=0.0942
    （3500-20a)*240(1-a%)+3000{1-(a*2)%}*360*{1+{2/9+20)%}=2067600
    0.0029*x^2-0.0757*x-41.83+0.0008*x^2-2*10^(-15)*x + 6*10^(-14)=0
    10449*330+500*（1100-x）=（128*x/(1100-x)+(x-60)*128/(1100-x)）/2*60*1400+0.5*100*128*x*x/(1100-x)

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