x＾2+1.86×0.00001-1.36×0.0000001=0
    s^2+4s+20=0
    2x+4（14-x）=38
    1/(x+31/2)+1/(x+1/2)=2/x+1/(x－6)
    A*A+A=240
    -x*x+2x+6=0
    18*18+16=x*x
    1.2^2*-0.5+0.98=x
    -2*x*x+8x-6=0
    14.75*sqrt(3)-x+6.5=x
    2500×1000000=13.8×1600×120×(1400-x/2)x
    2500×1000000=13.8×1600×120×(1400-x/2)×x
    [(-4x^3+4.1x^2-1.1x+0.025)*1.12*10^7]-x=0
    5+（x-3）×1.4 = 16.4
    2X + X等于48÷2
    -4x^3+4.1x^2-1.1x+0.025=0
    -4x3+4.1x2-1.1x+0.025=0
    5+（x-3）×1.4 = 16.2
    5+（x-3）×1.4
    2*x*x+5*x-10=0

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