50 = 359.45x - 6.8462
    0.3=（（0.021*x^1.85+128.7）^0.5）*x^0.84
    0.03=（（0.021*x^1.85+128.7）^0.5）*x^0.84
    11.8=（（0.021*x^1.85+128.7）^0.5）*x^0.84
    6.815=（（0.021*x^1.85+128.7）^0.5）*x^0.84
    X-X*0.065-（x+1000000）*0.0003=1000000
    X-X/1.05*0.015-X/1.05*0.015*0.07*0.5-(X-X/1.05*0.015)*0.02-(X-X/1.05*0.015)*0.005=27600
    （4x＋8）/（3x＋24）＝5/6
    120+0.4x=280+0.28x
    X-X/1.05*0.015-X/1.05*0.015*0.7*0.5-(X-X/1.05*0.015)*0.02-(X-X/1.05*0.015)*0.005=27600
    5x^2+2x-3=0
    x-0.02x-x*0.005=27600
    x-x/1.05*0.015-x/1.05*0.015*0.07/2-(x-x/1.05*0.015)*0.02-(x-x/1.05*0.015)*0.005=27600
    x-x*0.02-x*0.005=27600
    27600+x*0.02+x*0.005=x
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=92.320
    （6x-7）:5x=1:2
    （16-8x+x^2）（66-x）=x（33-x）^2
    1.7040291＝x^0.8677
    -1.0960663=ln（x）

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