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    arctan10x+arctan0.1x=90
    x^2+x-1=0
    x^3-12x+16=0
    32+x=(5+x)
    32+x=4(5+x)
    0.43X=X-0.49
    2×9.8×h=2×9.8×9.5-(2127÷(28h+0.8h²))²
    2×9.8×h=2×9.8×9.5-(2127÷(28h+h²))²
    x÷1.06×6%×1.12+5000=x
    12100*x/((1036-11*x)*0.385)=26
    18.5×18.5+(x-7)(x-7)=x×x
    16.5×16.5+(x-7)(x-7)=x×x
    0=-5x²+40x-68
    18-18x+3x*x-4x*(3-x)*(3-2x)=0
    9a^2-31a=0
    x=10/3(9-x)
    x^3-2x^2=144
    x^2-25X-425
    x2-25x-425
    X十100/x

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