(0.114+2x)÷[(0.0043-x)×(0.0143-x)]=7.02
    0.4x^2+1.7x-1=0
    0.71x^2-1.7x-1=0
    （（（（（（（（（（（（（（（（（（（（916.1-x）*0.98-1.38x)*0.98-1.38x)*0.98-1.38x)*0.98-x）*0.98-1.38x)*0.98-1.38x)*0.98-1.38x)*0.98-x）*0.98-1.38x)*0.98-1.38x)*0.98-1.38x)*0.98-x）*0.98-1.38x)*0.98-1.38x)*0.98-1.38x)*0.98-x）*0.98-1.38x)*0.98-1.38x)*0.98-1.38x)*0.98
    3x+2=5
    arctanx+arctan2x=90
    x×x×x-3×x×x-2×x＋1＝0
    arctan10x+arctan0.1x＝60
    arctan10x-arctan0.1x＝60
    x*x-1618*x+83857.948=0
    arctan(-x)-arctan0.5x-arctanx=-90
    e-0.2x=0.096
    x∧2-x-0.04248＝0
    19.36x^2+13256x-14677015
    1+x^2=0
    arctan（x-1）²
    9x^2-6x
    6/(a+1)=4.954
    6/(a+1)=4.95388
    a+1=0.567(a+2)

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