{[(x-55)/45]^2}*15.9=15.81
    {[(x-55)/45]^2}*15.8=15.71
    aeccos1.414
    2*x-4*sqrt(2)*x+13=0
    （X+5）÷（45+5）-X÷45=6%
    1/60×2×x+（x+2）×1/60×6
    1/60×2×x+（x+2）×1/60×6
    4*（x+28)^0.5+4=x
    lnx/2=x
    20a^2-72a+13=0
    1÷10x=330÷100
    1÷x=330÷100
    25x^2-126x-351=0
    sinπx
    （y/5）+（6950-y/8）=1000
    y/5+8/6950-y=1000
    y/5
    5/y+8/6950-y/8=1000
    5/y+8/6950-y/8=1000
    x+2x^2=100

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