x²-13x+12=42
    x²-13x+12=0
    (x-50)*5(150-x)=4000
    (y-50)*5*(100-y)=4000
    （x+1）²-3（x+1）+2=0
    2（x+3）²=x（x+3）
    x²-2√5x+2=0
    2x²-7x+7=0
    942+3x-6*167=-92.2
    （3x+2）（x+3）=x+14
    2500（1+x）²=9100
    2（1+x%）²=3
    （1200+200x-1600x-64000）（80-2x）=122000
    （44-x）（22+5x）=1600
    x^2+20x+49=0
    sint+sin4t=0
    0.469=288.15/273.15*0.793309*6.9*1000*1000*(100.6^2)/(x^5)*((1/100/x+192.2*x*12.91*0.001*0.001/100.6)^0.25)
    0.469=288.15/273.15*0.793309*6.9*1000*1000*(37.6^2)/(x^5)*((1/100/x+192.2*x*12.91*0.001*0.001/37.6)^0.25)
    0.469=288.15/273.15*0.793309*6.9*1000*1000*(129.7^2)/(x^5)*((1/100/x+192.2*x*12.91*0.001*0.001/129.7)^0.25)
    0.469=288.15/273.15*0.793309*6.9*1000*1000*(152.3^2)/(x^5)*((1/100/x+192.2*x*12.91*0.001*0.001/152.3)^0.25)

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