(sin2x)-2x+0.4π＝0
    15x^2-24x-8=0
    (sinx)-x+0.4π＝0
    (sinx)-x+0.4π＝0
    (sin2x)-2x+0.4π＝0
    (sin2x)-2x+0.4π＝0
    sin360-2x+0.4×180＝0
    sin360-2x+0.4×180＝0
    sin2x-2x+0.4π＝0
    sin2x-2x+0.4π＝0
    375000000-2860000x=（335-0.924x*42）*(1200000-0.307*x*50000)
    sin2x-2x+0.4π=0
    -x^2+120x-2625
    （0.6-x）×（0.3-x）=0.5×0.1
    -x^2+110x-907.5
    （0.37-x）×（0.34-x）=0.33×0.33
    -x^2+120x-1800
    500(1+x％)1000(1+x％/2)=660000
    500(1+x％)1000(1+x％/2)
    （0.61-x）×（0.1-x）=0.21×0.21

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