30%=(y×12.5×1.6667×0.4)(1-y×12.5×1.6667×0.4)
    30%=(x*12.5*1.6667*0.4)(1-x*12.5*1.6667*0.4)
    x=(x+200000)/1.06*0.06*1.12
    84.1 = 32.122ln(x) - 3.4908
    50 = 32.122ln(x) - 3.4908
    84.1 = 32.507ln(x) - 4.0352
    50 = 32.507ln(x) - 4.0352
    4.5×(1+x)×(1+x)×(1+x)＝6.5
    84.1 = 32.586ln(x) - 5.1759
    50 = 32.586ln(x) - 5.1759
    （4-8x）（1+3x）=4
    84.1 = 32.486ln(x) - 6.0634
    50 = 32.486ln(x) - 6.0634
    84.1 = 33.452ln(x) - 6.266
    50 = 33.452ln(x) - 6.266
    4x²＝-58x＋15
    4x2＝-58x＋15
    x*x-22x+117=0
    x*1%+x=8000
    x^2+2x-15=0

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