3.3a+1.7（1-a）＝2.7
    (2x+2)^2-x^2=80-(x+2)^2
    5％＝（500-x）÷x
    (0.075-x)/0.75=0.99
    38.15*(120-1.2x)=30*(0.2x-20)/ln((-40-1.2x)/(x-20))
    x^2+4/3x+1/6=0
    x+（x*0.13）=2
    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

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