3x^2+10x+5=0
    (1-x)*0.14>x
    x：1.6=2.5:3.2
    lnx=50
    4X+（180-X）×2＝510
    x*x-75x+350=0
    3x^(2)-4x+1=0
    1.3:18=x:3.6
    0.3:0.5=0.9:x
    x^2-4x+1=0
    log(10,a)=1.017
    3/10：1/2=9/10:x
    4628.8*x^(-0.2857)+183429.47*21426009*x^(-2.57)-240.215
    34/x=85/5
    -2x^2+1840x-403200
    0.6:x=3:15
    0.8:0.5=x:4
    X*2.1+X*1.8=839.38
    1346x^5 - 2976.3x^4 + 2615.2x^3 - 1112.2x^2 + 224.4x + 6.5885=50
    1346x5 - 2976.3x4 + 2615.2x3 - 1112.2x2 + 224.4x + 6.5885

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