0.04x^2+x^2=10000
    2*1.68^(-t/30)-2+2
    （x-1）*(x-0.00674)+(4+0.00674)x-6*0.00674+1=0
    x^(-10)+x^(-7)+x^(-3)=0.15
    46672.66x^5-0.5x-0.6=0
    x＋5/－13＝2
    1330x+30x^3=5880
    10x^2-9x+2=0
    e^(-x) = sin(x)
    26.6667*(x-2)+53.3333*(x-2.66667)+252.3153*(x-9.237771)+435.806*(x-10.9839) = 218.8708*(x-11.18777)+1317.371*(x-12.27369)
    26.6667*(x-2)+53.3333*(x-2.66667)+252.3153*(x-9.237771)+435.806*(x-10.9839)=218.8708*(11.18777-x)+1317.371*(12.27369-x)
    -10485=611-(8400-12500)+X
    -10485 = 611 - (8400 - 12500) + X
    85000=X/(1+6%)+X/(1+6%)^2+X/(1+6%)^3+X/(1+6%)^4+X/(1+6%)^5
    85000=X/(1+6%)+X/(1+6%)2+X/(1+6%)3+X/(1+6%)4+X/(1+6%)5
    tanx-x=9.8017
    3:4=0.95:4
    e∧(-10k)+e∧(-7k)+e∧(-3k)=5.85
    e^(-10k)+e^(-7k)+e^(-3k) = 0.15
    x*(500-x)*(640-x)=50000/1.45

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