50x^10+50x^9+50x^8+50x^7+50x^6 =314.541
    x*x-328x-328*328
    29*x+（0.5x+15）*40=6000
    29*x+（0.5x+15）*40
    40+X+40*X=25
    25200/x=15200/109
    22700/x=15200/109
    X+40+40*X=25
    7600/(102*0.22+x)+10000/x=150
    7600/(107*0.22+x)+10000/x+10000/(x+107*0.1)=150
    (2-2x)(1.2-2x)=1.28
    14000（1-x）（1-x）=11340
    x-1/x = √2/2
    2216*（1-x）=1367
    16X^X+36X-11=0
    （x-20）（-10x+340）=400
    44.5x^10+50x^9+50x^8 =182.25
    x^2 e3
    0.7x+50=（0.3x+50）x1.5
    1.4x-1.2x=54

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