x*2-920x+53261=0
    x2-920x+53261=0
    x^2-900x+4000
    1/2y+1=4y-2/5-y
    1/2y+1=4y-2/2-y
    10+4（x-3）=2x-1
    2x-1/3=x+2/2+1
    x-26=0.5x
    w^4+w^2=e^2
    w^4+w^2=e
    lgx=356.514
    (2.5*10^-6 -y)*(5+2.5*10^-6 -y)÷y÷(2.5*10^-6 +y)=6.1*10^34
    -0.5x+1=x*(-2x+4)+1
    x/7=x-612
    -0.5x+1=-2*x^2+4x+1
    S^3+3*S^2+2*S+1=0
    x^2=-1
    x^-3/4
    x-24×5÷3=120
    180*0.5+100*0.6+(x-280)*0.9=139.2

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