8/X=40/111
    （1-x^3）^2/3
    0.08/X=40/111
    5x+5
    8%/X=40/111
    8xx-51x+74=0
    3×(5^p)+p=378
    -300+x-x*2%-800*2%=30
    -2a∧3+(2-a)a+1=0
    -2a∧3+(2-a)a+1=0
    4（2x^2-2x-1）^2=（2x^2-2x-7）（4x-2）^2
    691X-691*1.436=483X-483*1.4327
    451X-451*1.439=315X-315*1.434
    451X-451*1.439=315*1.434-315X
    1500/(1500+x)=0.6
    x/(x+1000)=0.6
    a+0.05a=58.05
    -0.8x^4+0.3x^2+2=0
    a+0.05a=62.15
    4x^2-4x^4=49/625

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