x/abs（x）
    x+10^0.2x+2*10^4*x^2=1
    x^2+2*31.68*x=2.87*10^3*16*15
    x*16*5=(448.6)^2+2*448.6*31.8
    -4^x㏑-4=-2^x㏑（2）
    0.5*[(646.8)^2+2*646.8*x]=(448.6)^2+2*448.6*x
    32=(4*sqrt(3)-x)²+xx
    s^3+8s^2+12=0
    （100-x）（300+5x）=32000
    x^2+252x-141.75=0
    -8a^3-64a^2-128a+12=0
    x^3-1.8x^2+0.32x+0.52=0
    3.6*3.6+(x-2.4)²=xx
    (2.1)^(1-x)=1.69
    x^3+1/3*x+2/3
    (1.69)^(1-x)=2.1
    e^x^2sinx
    a×0.6=19.9
    a×0.6=38.9
    a×0.6=22.9

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