x/(1-x)^4=0.040796741
    x/(1-x)^4=0.159713897
    x/(1-x)^4=0.119785422
    x/(1-x)^4=0.079856948
    x/(1-x)^4=0.039928474
    x/(1-x)^4=0.155049895
    x/(1-x)^4=0.116287421
    x/(1-x)^4=0.077524948
    x/(1-x)^4=0.038762474
    3x（400-2X）+4X+5X=1560
    x/(1-x)^4=0.151223673
    4X-2X+30=60
    x/(1-x)^4=0.113417755
    x/(1-x)^4=0.075611837
    x/(1-x)^4=0.037805918
    20-x+0.5x=12.5
    20-x+0.5x=12.5
    20-x+0.5x=12.5
    3（400x2X）+4X+5X=1560
    3（400x2X）+4X+5X=1560

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