２k^2+3k-2=0
    sinx=0
    -16100+7800÷（1+x）+9100÷（1+x）^(2)+5300÷（1+x）^(3)=0
    x^3+2*x^2+6*x+1
    0.189/0.135*280
    1.5 + 0.07 * (12 + 0.035 * (50 + 0.013 * 200)) = x
    [x(1+2x)^2]/[(0.1-x)(1-2x)^2]=10^6.41
    1-x>0
    2*(a-3)=1/3*(2*a-1)
    0.5ln2
    10051÷1.05× X=12061.12
    ln2/2
    e^0.766746
    e^x*x^2=1-lnx
    arcsinx=arctanx
    x/8-8.6=0
    4900xx-168√3x-1089=0
    4+p/8=5.6
    4+8/p=5.6
    1.5s + 10 = 12.25

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