-47/119*14/3+14/3b+14/3
    -47/119*14/3+14/3b+14/3
    -47/119*14/3+14/3b+14/3
    -47/119*14/3+14/3b+14/3
    e ^x －x=x －lnx
    e ^5.2 －5.2 = x
    e ^ x －x = x －lnx
    4x十3一x＝27
    0.8*t=acos(9*(5.5225+3.525*sqrt(cos(t)*14.44-3.42))/38/(5.5225-3.525*sqrt(cos(t)*14.44+3.42)))
    0.8*t=acos(9*(5.5225+3.525*sqrt(cos(t)*14.44-3.42))/38/(5.5225-3.525*sqrt(cos(t)*14.44+3.42)))
    0.8t=arccos(9*(5.5225+3.525*sqrt((cost)*14.44-3.42))/18/(5.5225-3.525*sqrt((cost)*14.44+3.42)))
    0.8t=arccos(9*(5.5225+3.525*sqrt((cost)*14.44-3.42))/18/(5.5225-3.525*sqrt((cost)*14.44+3.42))
    2.6X-X等于1.8
    10*2000=x+1150*10
    100=300x-280-(159+1)x
    x*1000=600000+(900+100)1000
    xx-x-60=0
    xx-210x+540=0
    x*1000=600000+(900+100)1000
    222=x*395.6/0.2826+0.8*（1-x）*120

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