(2.78x)/(1400+x)＝1.667
    x+1/x-1
    9/411+1/30+42/1177=11457/x
    9/411+1/30+92/2354=11457/x
    1015.91=X+X*5/10000*18
    x*x-x-2070
    19817062.98-（70211.85-（X-19565956.46）/1.03*0.03-42803.09）*1.12-510.21=X
     (14)(x+800)+(14)(x+500)+2*9x/12+7x/12+9x/12+11x*26/12+81x =742772.33-24100
    19857062.98-（70211.85-（X-19565956.46）/1.03*0.03-42803.09）*1.12-510.21=X
    19841811.95-（70211.85-（X-19565956.46）/1.03*0.03-42803.09）*1.12-510.21=X
    20070365.08-（70211.85-（X-19565956.46）/1.03*0.03-42803.09）*1.12-510.21=X
    20070365.08-（850343.48-X/1.03*0.03-42803.09）*1.12-510.21=X+19565956.46
    20070365.08-（850343.48-（X-19565956.46）/1.03*0.03-42803.09）*1.12-510.21=X
    3/2x=0.2x²+5
    (x-180)/2400=(x-450)/2000
    (x-180)*(1-25%)/2400=(x-450)(1-25%)/2000
    3997116=X-X*12%/1.05*0.05
     (14)(x+800)+(14)(x+500)+2*9x/12+7x/12+9x/12+11x*26/12+81x =743162.33-24100
    x²+（x-2）²=（x+2）²
    xx+（x-2）x=x（x+2）

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