（1.69-1）/(x-1.9)=(2-1.69)/(1.79-x)
    x-ln（x）=1.5
    3.38*（1+x）=4.1002
    (1-x)*1000000=e^40x
    1-x=e*40x
    0.132/x＝0.1289/0.86289
    0.4/100.58＝x/33.2
    （26.253+x）×2＝52.306+70.359-x
    x^2-7.4x+12.3=0,X
    x²-5.1x+5.6=0
    sqrt(5)^2-x^2=(5/2)^2-(5/2-x)^2
    135000000=16.7*250*x*(455-x/2)
    X2=25
    x²-2X-100=0
    4X²-2X-1=0
    -0.0045x+lnx=ln2.2222222
    2×k^4+6×k^3+24×k^2+96k+256=256
    2×k^4+6×k^3+24×k^2+96k+256=255
    sink=cosk
    sink=0.7

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