50 = 382.14x + 0.7889
    tanx＝0.6848
    tanx＝0.2356
    tanx＝0.3
    X*(15200+1142*X+sqrt(7600*(38+4*X)*(200+9*X)))=5280000
    X*(15200+1142*X+sqrt(7600*(38+4*X)*(200+9*X)))=10290000
    X*(15200+1142*X+(7600*(38+4*X)*(200+9*X))^0.5)=10290000
    (5+x)/(9+x)=3/5
    0.32+0.0008(300-x)=0.3+0.0009*x
    0.0014*（9/14）*x=0.02+0.0008*［700-(23/14)*x］
     0.0014*（9/14）*x=0.02+0.0008*［400-(23/14)*x］
     0.0014*（9/14）*x=0.02+0.0008*［700-(23/14)*x］
    5000=X/(1+7.33%)²+X/(1+7.33%)^4+X/(1+7.33%)^6
    X/1.09*0.09-X/1.03*0.03=233204.97
    X/1.09*0.09-X/1.03*0.03=48775.78
    x^2+x-1/4
    x^2+x+1/4
    x^2-x+1/4
    x^2-x-1/4
    6x^2+6x+1=0

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