1/x+1/(x+1)+1/(x+5)=1/(x+8/7)
    22×x＾2+141×x+88=0
    -lnx/x-1/x
    d^3+10d^2+25d+15=0
    d^3+10d^2+20d+15=0
    S^2+10S+100
    S2+10S+100
    x/(1+2x^2)
    2+（1/2x）/（x/4-20）=5
    （1/2x）/（x/4-20）
    (a-1)/(a+1)
    x÷72＝x÷90+0.1
    161x=1337x
    lnx×lnx×lnx=x-1
    (X-4)-(x+1)=2
    x^2-2115x+188046=0
    x∧2-6x+4＝0
    x^3-100x=24000
    x²+2x+1＝5
    X+20%X＝2700

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