6x^2-66x+108=0
    -5(x-20)^2+500
    (x-10)(-5x+150)
    875875x-875875sinx+3×300×3820x÷2÷π=1432500
    2x^2+3x+1=3
    150x+80(50-2x)/3 = 2010
    150x+80(50+x)/3 = 4020
    150x+80(50+x)/3=2010
    5x+30-85=3x+85
    857857x-857857sinx-573000x/π=1432500
    （2x-1）（x+1）=0
    -sinx
    14440000x^2+190x-43.2=0
    2/3*((1-1/0.055)+(3/4+1/0.055)*(1/3*215.7/x*0.35805183739485175)^0.055)=7.235784314/x
    2/3*((1-1/0.055)+(3/4+1/0.055)*(1/3*214.7/x*0.35805183739485175)^0.055)=6.774215686/x
    x+x*0.00066=0.4432
    2/3*((1-1/0.055)+(3/4+1/0.055)*(1/3*219.22/x*0.35805183739485175)^0.055)=7.639411765/x
    2/3*((1-1/0.055)+(3/4+1/0.055)*(1/3*223.87/x*0.35805183739485175)^0.055)=7.936568627/x
    2/3*((1-1/0.055)+(3/4+1/0.055)*(1/3*226.72/x*0.35805183739485175)^0.055)=8.345294118/x
    2/3*((1-1/0.055)+(3/4+1/0.055)*(1/3*229.51/x*0.35805183739485175)^0.055)=8.474019608/x

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