(x-x/1.13*0.1)/7.08=0.0736
    （41.789+x）×1.55＝70.248+41.789－x
    （41.789+x）×1.45＝70.248+41.789－x
    0.456*s*s+12*s-12.3
    （41.789+x）×1.35＝70.248+41.789－x
    （41.789+x）×1.25＝70.248+41.789－x
    s*s+12*s-12.3
    s*s+3*s-12.3
    （41.789+x）×1.15＝70.248+41.789－x
    （41.789+x）×1.15＝70.248+41.789－x
    5168*（1+x）^2=5334
    x＾2＋3x＋1＝0
    -x^3+3x^2+x-3
    (x-1)^2/3(x+1)
    cosx＝0.959
    cosx＝0.537
    x-5+4/x
    x-5+x/4
    x²/9
    200（x+2）=150xx2

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