1/(y+1)=1
    1/y+1=1
    0.0677*x^2-56.292*x+12925
    e^（x+1）+e^（-x）-e-1=0
    x^2-2x-1=0
    x*99.975%-135.025*100.025%=1/10
    X(5-X) = 4
    X(5-X) = 7
     (12-2X)(8-X) = 48
    (12-X)(8-X)=48
    100-X*X=16
    (2-X)(2-X)=1
    (2-X)(2+X)=1
    x^6-6x^5-15x^4-20x^3-15x^2-6x-1=0
    （60a-2191.36-（60a*13%-170）*12%）*75%=131.24
    x+1/x
    π*(D^2-74^2)=2000000*4*0.042
    x*99.975%-109.971*100.025%=1/10
    1^x=4
    x^2-16.2x+64.6=0

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