√2^x
    （500-x）*1000-50000=242000
    k^2-6k-23=0
    k^2-6k-23=0
    t^2+8t-10
    t^2+59t-2400
    0.9309x＾3-1.2325x＾2+0.9378x+0.0096 = 0
    0.9309x＾3-1.2325x＾2+0.9378x+0.0096= 0
    0.9309x＾3-1.2325x＾2+0.9378x+0.2842 = 0
    0.9309x＾3-1.2325x＾2+0.9378x+0.2842=0
    （15-x）*（18-2x）=224
    X-120/X×（X-80）＝24%X
    （X-120）/X×（X-80）＝24%X
    xexp(-x)
    x^4+x^3+x^2+x+1=0
    x^2=1
    7600/(x+13.44)+20000/(x+22.4)+7600/(x+35.84)＝150
    15200/(x+35.84)+20000/(x+22.4)＝150
    15200/(x+35.84)+20000/(x+22.4)＝150
    （10000-2400）/（x+35.84）+10000/（x+22.4）+10000/（x+22.4）+（10000-2400）/（x+35.84）＝150

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