12k∧2-35k+48=0
    0.25xx-x-3=0
    0.25x-x-3=0
    3.995=（（0.0219*x^1.85+129）^0.5）*x^0.84
    45576472.16*(1-x)*x=1412982.5
    1.6997x^2+0.444x+0.0026=0
    6/5:3/2=x/2
    x+1=2
    5/6x=3/4
    5/6x=4/3
    5/6:2/3=x/2
    5/6:2/3=2:x
    5/6:2/3=2/x
    5/6x=4/6
    5/6:2/3=2/x
    2/3*((1-1/0.055)+(3/4+1/0.055)*(1/3*210/x*0.35805183739485175)^0.055)=5.352941176/x
    2/3*((1-1/0.055)+(3/4+1/0.055)*(1/3*210/x*0.35805183739485175)^0.055)=5.482843137/x
    2/3*((1-1/0.055)+(3/4+1/0.055)*(1/3*211/x*0.35805183739485175)^0.055)=5.874705882/x
    2/3*((1-1/0.055)+(3/4+1/0.055)*(1/3*212.13/x*0.35805183739485175)^0.055)=6.036078431/x
    560+480/x=-1/25*(875*(1+x)/(12.5+5*x))^2+14*(875*(1+x)/(12.5+5*x))

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