0=60t-1.5t^
    160X0.92
    x^2+（10-x）^2=10
    x^2+（10-x）^2=7√2
    x^3+27-26x=0
    2x^2+x-3=0
    2x^2-x+3=0
    2x^2-x-3=0
    x^3+x+81=0
    0=8x-15/2-5/2
    380=9x+1/2x^2
    5*sqrt((0.352x)^2+1)=x*sqrt(x^2+1)*sqrt((0.25x)^2+1)*sqrt((0.11x)^2+1)
    5*sqrt(7.97)=x*sqrt(x^2+1)*sqrt((0.25x)^2+1)
    2X+X+1=X+3+X+2
    5=(0.25*x)^2
    5*sqrt((1.036x)^2+1)=x*sqrt(x^2+1)*sqrt((0.25x)^2+1)*sqrt((0.074x)^2+1)
    x*3.6*sqrt(14)=1
    5*sqrt(14)=x*sqrt(x^2+1)*sqrt((0.25x)^2+1)
    0.3（x+4）=9
    3.14*(D^2-74^2)=600000*4*0.23

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