（500-x）*1.25 x=520
    12x²+10x+1=0
    （x+18）/（x-18）=74/65
    450/x-450/（x+5）=1
    (-(3*x^2)/100000)+0.0018*x-0.0196
    −0.00003x2+0.0018x−0.0196
    450/x-450/（x-5）=1
    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

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