s^3+50s^2+5000s+5000*140=0
    10^6*0.1*0.15*2/3
    -3k-36*15k-30=0
    x^2-2100x+85741.96=0
    x^2-3040x+239610=0
    2x+0.44*3+1.46*2=5.7
    x^4+5.74x^3-7.91x^2-58.27x-73 = 0
    1/d+1/(d+50)+1/（d+100)=0
    20*4*1000*0.000165/0.075^2/0.15^3
    0.075/2*(0.075^2-0.035^2)
    0.5X-(3*0.11X)/5X
    1/d+1/(d+4)+1/(d+5)=0
    x^4+5.74x^3-7.92x^2-58.2x-73.25=0
    2*(67.1-X)=67.1-0.9X
    1.7/（34-x）+1.2665/(25.33-x)+2.267/(22.67x)+0.80/(1-x)=0
    20*4*0.075/0.075/0.15^3*1000
    20*4*0.035/0.075/0.15^3
    x^2-4.34x+4.34=0
    8/1.2
    0.2*0.03^3/12+(0.215-0.1575)^2*0.2*0.03+0.03*0.2^3/12+(0.1575-0.1)^2*0.2*0.03

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