143/858910.22*(1752878-858910.22) =X
    3/8+x＝9/14
    X^2-10 x+22=0
    X=(X-1100)/0.02*0.13
    (49/858910.22)*(1752878-858910.22)=x
    (49/x)*(1752878-x)=51
    49%x*(1752878-x) =51
    5x^2+2.7368*x+0.61x^2=2.31
    K=1004+20.08+0.01K+22.75+0.0002K+52.34+0.0005K+0.0533K
    K=1161.5+23.23+0.01K+26.37+0.0002K+60.56+0.0005K+0.0533K
    2/x＋1
    X^2+X-6=0
    2x^3+x^2=1
    sin（1/x）
    -X＋(X/3)
    sqrt((sqrt(4-x^2)/2)^2+(sqrt(4-x^2)+x/2)^2)=1+sqrt(2)
    sqrt((sqrt(4-x^2)/2)^2+(sqrt(4-x^2)+x/2)^2)=1+sqrt(2)
    80xx-x-40=0
    tanx²/cosx
    1/ex

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