127.820*99.975%-x*100.025%=1/10
    (30x/628000)-9.1=30x/979060
    (x/628000)-9.1=x/979060
    200/（x√（0.01x²+1））=1
    200/（x²√（0.01x²+1））=1
    （3.45+1.5*x）*x=5.48*1.2
    x*99.975%-120.151*100.025%=0.5/10
    x*99.975%-120.151*100.025%=1/10
    0.05=-0.0042x+0.0917
    0.05=-0.0042x+0.0917
    0.05=-0.0445x+0.1085
    0.05=-0.0894x+0.1468
    5=-0.0894x+0.1468
    （825+x）/（873+x）=0.9684
    825+x/873+x=0.9684
    1000=1.44/（600+2x）0.001
    1000/X+2000/x^2+600/x^3+4000/x^4=7000
    1000/X+2000/x2+600/x3+4000/x4=7000
    0.15×250+0.15×300+0.35×320+0.35x=300
    -1*（1-X^2）/（1-x）＝0

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