1/x+1/（x+0.1）+1/(x+2)+1/(x+5)-1/(x+0.3) = 0
    1/x+1/（x+0.1）+1/(x+2)+1/(x+5)-1/(x+03)=0
    603.6(1+8％)（1+x）＾2+824.32（1+8％）＾2（1+x）+969.18（1+8％）＾3=1000（1+x)＾3
    603.6（1＋x）＾2+824.32（1+x）+969.18=1000(1＋x）＾3
    10/87+（85-X）/126-X/1000=0.286
    X/87+（35-X）/126-.06=0.238
    X/87+（40-X）/126-.055=0.238
    X/87+（40-X）/126-.55=0.238
    sin(x)/2=tan(x)
    8c²－9c－45＝0
    x+4lnx=1
    (x-6.38)/x=77%
    (x-6.38)/x=70%
    (x-6.38)/x=60%
    (x-4.47)/x=80%
    (x-6.38)/x=70%
    (x-7.13)/x=70%
    (x-14.04)/x=60%
    (x-8.03)/x=80%
    (x-6.38)/x=80%

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