50x^10+50x^9+50x^8=214.797
    (2x+1)/3-1＝(5x-1)/6
    n0=4-2435+52535353737324727-038383838
    n0
    x*x+x=210
    x*x+x
    y*y*y=210
    yyy=210
    y3=210
    (y*y)+1y=210
    (y*y)+1y
    (x+x)*(x+x)=210
    (x+x)*(x+x)
    800/2.5/x=800/x-24
    5*75+（15*（x/10）-8）*90=735
    450+（15*（x/10）-8）*75=735
    150+（15*x/10-8）*225=735
    1.25*x^2-10*x-55=0
    x*x+x=210
    x*(x+1)=210

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