（X-4500）/1.13*0.13=0.12%X/1.13
    （X-4500）/1.13*0.13=1.2%X/1.13
    x+128+x+2x=1600
    0.57+1.06x+0.21x^2=0
    (192539*(8+x)-180000)=275000*(8+x)*0.7
    0.85x=980
    0.85x=858
    0.85x=758
    0.85x=528
    x*2.32*1.3=2.63
    0.85x=530
    0.85x=528
    √2(80-x)x=10000-160x
    199360*X=18000
    （x+3）²＝（2x+1）²
    x*x+x=2020
    x²十10=8x一1
    x十10=8x一1
    x2十10=8x一1
    abs((1+x+sqrt((1+x)^2-4*x))/2)=1

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