x2+0.054x-0.0054=0
    2╱1－5m－m＝2
    （x+40-20）+（x-40+20）＝180
    y＝e
    X-（0.5x+3）=38
    20x^2+4x-21
    （50*3*60）÷（60-50）=x
    1.21*x*2.79*1.05=2.65
    1/4X+（2/5X-7）＝X-35
    x+4+20+15%x+（x+15%x）*13%=2600
    x^2-x^4=1/36
    n^(n^4)=64
    xxx-10xx+130=0
    n^(n^4)＝64
    n^（n^4）=64
    x=0.08726*156.25-2.88492
    x=0.08726*156-2.88492
    8.94=0.08726x-2.88492
    8.9=0.08726x-2.88492
    x²+1.4x-7.2=0

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