x^2-70x+825 = 0
    2×x^2-33x+135 = 0
    x（44-2x）=224
    a^5+a^4+a^3+a^2+a+1=0
    622.301592*√（584.76-x∧²）＝683888.5152-2×x∧²
    cosx ＋3
    154386x-4718x-453.91x-4125.98 = 36272
    5*x^20-x^40=4
    154388x-4718x-453.91x-4125.98=3627202
    x^4
    2=x/46125
    x＝tanx
    83.3×x+4×69＝82.6×x+4*82.6
    60*x=1/(1+0.01327*49)
    60*x=1/(1+0.163173*4)
    60/99=(1+0.01*x)/(1+4*x)
    60*x=1/(1+0.660905*1)
    60/99=(1+0.01*x)/(1+1*x)
    x＾4-4x＾3-25=0
    60*x=1/(1+0.0.01327*49)

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