(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
    9a × 3a
    （9x+3x）
    x^x=1/2
    x-1=x
    arctan0.0025x+arctan0.05x＝-90
    x^15-29x^7+22x^1.2-9等于0
    x^x^x^x=2
    arctan0.01x+arctan0.05x＝-90
    b=3822*1.2*0.75/15/100+0.4

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