2（x-3）²=x²-9
    x/18-x/27.78=2240*8.18
    6.47y^2+42.69y-212.77=0
    4+4*(1+r)+3*(1+r)^2+2*(1+r)^3=8*(1+r)^4
    0.5011X^2+83.4637X-132.7074=0
    -6.47x^2+78.17x-115.76=0
    (0.01x+220)*45=x
    (0.01x+220)*70=x
    (21.42h²+113.395h+102.89) (42.84h^2+231.269h)/(128.52h+514.146 )=1.2*1.0*(0.007×(0.023+0.8+2+1.2+h)+15.747×(0.373+2+1.2+h)+16.616(0.635+1.2+h)+(17.489h+5.145h²+13.578)*(10.29h^2+44.198h+40.114)/(30.87h+32.394))
    10lgx=-9
    10lgx=3
    2/3*((1-1/0.2)+(3/4+1/0.2)*(1/3*214.13/x*0.35805183739485175)^0.2)=7.94/x
    2/3*((1-1/0.2)+(3/4+1/0.2)*(1/3*214.13/x*0.35805183739485175)^0.2)=7.611/x
    2/3*((1-1/0.13)+(3/4+1/0.13)*(1/3*214.13/x*0.35805183739485175)^0.13)=7.611/x
    2/3*((1-1/0.07)+(3/4+1/0.07)*(1/3*214.13/x*0.35805183739485175)^0.07)=7.611/x
    2/3*((1-1/0.06)+(3/4+1/0.06)*(1/3*214.13/x*0.35805183739485175)^0.06)=7.611/x
    2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*214.13/x*0.35805183739485175)^0.05)=7.611/x
    2/3*((1-1/0.03)+(3/4+1/0.03)*(1/3*214.13/x*0.35805183739485175)^0.03)=7.611/x
    2/3*((1-1/0.06)+(3/4+1/0.06)*(1/3*215.7/x*0.35805183739485175)^0.06)=7.94/x
    8.3335X/(1-8.3335X)=0.3

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