x/(1-x)^2=(0.98-x)*0.25*10^4
    3.2:0.4=x:8
    -1.672-0.353/0.03=x-0.353/-0.002821
    -1.6720-0353/0.03=x-0.353/-0.002821
    -1.6720.0353/0.03=x-0.353/-0.002821
    2x+1=7
    201+y=256
    201+y
    x^3+3*x+2.4=0
    500*150＝X100
    -lnx=0.386
    150/500＝100/X
    28（2X+8）＝80
    7x^6-8x^7=0
    x^2+10*(x-1)^2-5
    x^3-x^2+5*x-6
    (5-2)/2 - (4+x)/3 =1
    x^3-x^2+5x-6
    x=1.9×0.723×138.22/200000×(1.9×30+0.08×40/0.0251)
    x^2-7x+11.29=0

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