y =-5×5+16×5-60
    y =-25+80-60
    250-x=10000/x
    2500-x=10000/x
    2500-x=x/10000
    x^3=0.5
    2*x^3=(1-x)^3
    1271.8x=0.9906-11.6422x^（2/3）
    x^3=(1-x)^3
    （0.2+x）×（400+x/5）=0.15
    1/x+1/(x+3)+1/(x^2+2x+2)=0
    2z^3+8z^2+13z+6=0
    (89-x)*x=1600
    11x*x-20x-36=0
    18%/x=20%/100
    a²-16a-80=0
    a²-16a-80=0
    （7.36-7.36/1.13*0.13）/7.08=X
    （7.21-7.21/1.13*0.13+0.15）/7.08=X
    220000×（1+x）^3-220000=15510

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