1/x+x-88=999
    1/(1/750+1/x)=400
    x^2-47/7x+841/49=0
    0.7384x-0.0828sin(2πx)-0.091=0.21(sin(πx))^3+0.0384sin(πx)+0.0384sin(1.25π-2πx)
    0.6674x-0.0748sin(2πx)-0.08225=0.21(sin(πx))^3+0.0384sin(πx)+0.0384sin(1.25π-2πx)
    3x*x-2x-6=0
    0.020=0.0076X∧0.996
    0.153=0.0076X∧0.996
    0.019=0.0089X∧0.9859
    0.019=0.0089X∧0.9859
    0.1226=0.0089X∧0.9859
    0.153=0.0076X∧0.996
    x-6:75%x+6＝3:2
    2.1348=x^0.9859
    x=0.5123*(1-x*x）^0.5
    x=0.4413*(1-x*x）^0.5
    2.1348=x^0.6859
    2x^3+11x^2+10x+8＝0
    13.775=x^0.9859
    2x^3+11x^2+10x+8＝0

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