0.4/100.58＝x/32.1
    （25.851+x）×2.05＝51.702+70.453-x
    0.128/x＝0.1289/0.86289
    0.4/100.58＝X/32.2
    8.4*8.4*x-x*(0.6+2*0.355)*(0.6+2*0.355)=1490
    8.4*8.4*x-x*(0.6+2*0.355)*(0.6+2*0.355)=2131.206
    1/x-1/x^3
    x^2-16.5x+ 67.3=0
    448+16x=4x²+32x+64
    x^2+1.8x=1.75×10^(-5)
    x^2+1.8x=1.75×10^5
    x^2+1.8000175x-0.0000035=0
     x^2-1.06×10^-3(0.065-x)=0
    57.3*2*x=90
    20/(x*sqrt(1+0.25x^2))=1
    20/(x*sqrt(1+x^2))=1
    x=64.69+400+0.0672x+5702.94
    x=5702.94+0.0672x+64.49+400
    10（x-1.4）（x-1.8）（x-2）/0.32+（x-2）（x-1）（x-1.8）/0.12-（x-1.4）（x-1）（x-2）/0.064-（x-1.4）（x-1）（x-1.8）/0.096＝0
    10（x-1.4）（x-1.8）（x-2）/0.32+（x-2）（x-1）（x-1.8）/0.12-（x-1.4）（x-1）（x-2）/0.064-（x-1.4）（x-1）（x-1.8）/0.096＝0

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