12.01c=（3.4+c）×7.98
    -58570+x-x8%/4=10000
    58570+x-x8%/4=10000
    5x^2-72x+108=0
    5%=37.5%x+（1-x）*（-20%）
    40×（1－x）²＝32.4
    3.14*(500^2-74^2)=X*4*0.38
    40/a=4+0.1a
    (40-x-30)(48+8x)=504
    3.14*(D^2-74^2)=2000000*4*0.042
    3*x*x+2*x+1/x*x+x+2
    100=300X−2800000-160X
    84.1 = 37.101ln(x) - 8.2416
    50 = 37.101ln(x) - 8.2416
    30X=60
    100=300X-2800000+160X
    x^2-9.1x+19.1=0
    x^3-x^2-x-2=0
    84.1= 36.448ln(x) - 6.9836
    50 = 36.448ln(x) - 6.9836

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