2.17=x+0.45×√（0.9+x）
    2.17=x+0.45×√（x-0.9）
    3-x^2 = 4-(√(4-((√3)/2)^2)-x)^2
    84.1 = 38.106ln(x) - 11.009
    50 = 38.106ln(x) - 11.009
    84.1 = 38.901ln(x) - 8.0409
    50 = 38.901ln(x) - 8.0409
    84.1 = 40.294ln(x) - 12.11
    50 = 40.294ln(x) - 12.11
    x*99.975%-114.035*100.025%=2/10
    x*99.975%-114.035*100.025%=1/10
    x*99.975%-114.035*100.025%=0.5/10
    1.56=(50.24-156.19+x+((50.24-156.19+x)/(14+134))*(-254)+25.77)/(14+134-254+74)
    0.6cosa+12.5sina=0.75
    x*99.975%-120.106*100.025%=0.5/10
    x*99.975%-120.106*100.025%=2/10
    x*99.975%-120.106*100.025%=1/10
    x1/4
    tanx=x
    3x^2-9x=0

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