x/450-（x-5）/450=1
    5％＝（500-x）*x
    5％＝（500-x）/x
    tanx＝0.15
    （x-1）^3（x+2）-4=0
    x^3+x^2-x+3=0
    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

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