1.3586=-2E-08x^6+9E-07x^5-2E-05x^4+0.0001x^3-0.0003x^2+0.0036x+1.3325
    1.3403=-2E-08x^6+9E-07x^5-2E-05x^4+0.0001x^3-0.0003x^2+0.0036x+1.3325
    1.3386=-2E-08x^6+9E-07x^5-2E-05x^4+0.0001x^3-0.0003x^2+0.0036x+1.3325
    19.6x^3+248.43x^2-1990.79=0
    2(1-x)(1-x)(1-x)=x(2-x)(3x-1-x2)
    2(1-x)(1-x)(1-x)=x(2-x)(3x-1-x×x)
    【（260+260+220）*81-x】*0.85+（32+32+8）*（63+18）=49860
    (124+282)/31*x+265/31*(x+15)+106.5/31(x+30)=1208
    (187+313)/31*x+234/31*(x+15)+106.5/31(x+30)=1208
    (x/(2-x))/(1-x)/(1-x)*(2-x)*(2-x)=0.99
    (x/(2-x))/(1-x)/(1-x)*(2-x)*(2-x)=0.099
    （440*63-x）*0.85+8*63=21254.45
    ｛（220+220+260）*81-x｝*0.85+（8+18）*81=46202
    （260*63-x）*0.95+8*63=13468.15
    C(m-1,m-1)+C(m,m-1)+C(m+1,m-1)+C(m+2,m)=C(m+3,m)
    C(m-1,m-1)+C(m,m-1)+C(m+1,m-1)=C(m+2,m)
    C(m-1,m-1)+C(m-1,m)+C(m-1,m+1)=C(m,m+2)
    1.6317(2x)^-0.123+168.5313(2x)^-0.154=0.1937
    (16-2*x)^2+12^2=(16-x)^2
    555x=1000000

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