1.7*10^7＝x/［（1-2x）^2（0.02-x）］
    (x-2)×(x-2)-4×4×(x-5)=0
    4x(2-1)=3(2x-1)
    x^(x+1)=16
    x*99.975%-119.598*100.025%=0.5/10
    x*99.975%-119.598*100.025%=1/10
    x*99.975%-119.708*100.025%=0.5/10
    x*99.975%-119.708*100.025%=1/10
    x^-3
    30/x=36/1.8x+20/60
    87013.33x^9=136845
    87013.33x^9+87013.33x^8+87013.33x^7+87013.33x^6+87013.33x^5+87013.33x^4+87013.33x^3+87013.33x^2+87013.33x^1=136845
    2x-x=26+29
    2x-26=x+29
    2（x-13）=x+16+13
    -2*x^2-x+2=0
    -2x^2-x+2=0
    （60-x）*（120+10x）=1800
    6＝-1/k+（16+1/k）e-2k
    6＝-1/k+（1）

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