1575*(1+X)^3=1800
    1200*(1+X)^3=1800
    2280*(1+X)^3=4050
    1200*（1+X）^3=1800
    x²-（X-4）²=50
    190*（1+X）^3=270
     (X -100) ÷ 200 = (X-20) ÷ 400
    X/200=X/400
    (X-240)*(1-25%)/（2000+250）=(X - 240 - 1000 x 10%) x (1-25%)/2000
    (X - 240) x (1-25%)/(2000 + 250)=(X - 240 - 1000 x 10%) x (1 - 25%)/2000
    （x-1440）*（1-0.25）/5250=（X-1980）*（1-0.25）/4000
    x+(1÷x)^2
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=87.407
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=94.928
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=93.470
    12%=x*(1+3.7%)/10+3.7%
    12%=x*(1+3.7%)/10+3.7%
    12%=Xx(1+3.7%)/10+3.7%
    x^x＝7
    sin2x=0.6

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