-X^2＋8X-12＝0
    427941.25-x=0.1x/1.05*0.05
    x^2-30x＋100＝0
    x^2-62x＋441＝0
    7800/（x+101*0.12）+17500/x＝150
    7600/（x+101*0.12）+17500/x＝150
    （x+1）*e^（-x）＝1/2
    xe^（-x）＝1/2
    x lnx
    1000*（X-180）=1500*（X-500）
    1-{1-[(1-x)*0.24]*0.24}*0.24=0
    x^2-20x-10x＋100＝0
    1.58=9.8*k
    20*k=lg((k+0.16)÷(k-0.16))
    e20k=(k+10)÷(k-10)
    e20k=(k+0.16)÷(k-0.16)
    (x+1)^2*ln(x+1) =-2x-1
    (x+1)^2ln(x+1) =-2x-1
    （1+x）^5-5.67*x-1=0
    x^2+4x=10

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