1.603*(f+f-0.94)+0.399*(f-0.94+f-7.59)+6.060*(f-7.59+f-11.05)=6*140*195*2/1000
    x*99.975%-120.467*100.025%=1/10
    x/620=（1000-x）/580+1.4
    （480*63-x）*0.85+18*63=26484.77
    （26.274+x）×1.35＝52.549+70.623-x
    （26.274+x）×1.55＝52.549+70.623-x
    （26.274+x）×1.75＝52.549+70.623-x
    （26.274+x）×1.975＝52.549+70.623-x
    （26.274+x）×1.95＝52.549+70.623-x
    （26.274+x）×2.15＝52.549+70.623-x
    （26.274+x）×2.35＝52.549+70.623-x
    （26.274+x）×2.35＝52.549+70.623-x
    x^2-(1/√3)*x-(2/3)=0
    -2*（1-x^2）/(1-X)=4
    -2*（1-x^2）/(1-2)=4
    1/d+1/(d+25)+1/(d+100)=1/(d+38)
    sin(2x-2π÷3)
    1/d+1/(d+25)+1/(d+8)=1/(d+71.42)
    1/d+1/(d+25)+1/(d+8)=1/(d+71)
    X^2+(25/8-3/2x)^2=4

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