x^3-2*x^2-2=0
    x^3-4*x^2-2=0
    1=1/2x^2+1/2x-2
    100（0.25*x*x+1）/(x*x*sqrt(100*x*x+1)*sqrt(0.0001*x*x+1)*sqrt(0.025*0.025*x*x+1)) = 1
    x^5-4*x^2-2=0
    3x^3+x+2=0
    Xx30-x=27-x
    8x=64
    20m=300
    （1+0.35*10*x）*（1+x）/0.35=0.18
    (-4. 673798--3. 897610)/0.003=(x--3. 897610)/0.002437354
    (2.138357-1.887260)/0.003=(x-1.887260)/0.002437354
    x^2-9x+4=0
    y=2.4
    (x+41)×7÷2=217
    0.5*x^3+x^2-6=0
    x^2+5x-16=0
    x^3+x^2-6=0
    （1+0.3*10*x）*（1+x）/0.3=0.18
    √3/(2√3*a-8)=2*a-4√3

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