1000*1+i+1000*(1+i)^(2/3)-200*(1+i)^0.5-500*(1+i)^(1/3)=15000
    8.854187817/1000000000000*67.8077/0.0000000016729*(1.2/2-x*8.314*298.15/96485.33289)-(2*0.6*1000/3.14/0.72/6.02214076/100000000000000)^0.5*(exp(x/2)-exp(-x/2))/2*96485.33289=0
    32.78x/44.63-44.62*44.62*1091744.45/(x^2)/32.78/32.78=x-589223.09/(x^2)+27.528
    32.78x/44.63-44.62*44.62*1091744.45/x/x/32.78/32.78=x-589223.09/x/x+27.528
    32.78x/44.63-44.62*44.62*1091744.45/x/x/32.78/32.78=-49
     3X+15=4X+5
    600÷x=450÷（x+10）
    x-1091744.45/x/x=-49
    128=sin（πx）^2/sin（πx/16）^2
     x^2+1=0
    x÷3 = 1.2
    x÷3=1.2
    297*x*x+108*x+168=0
    2.5x=14
    0.061 = 0.2493ln(x) + 0.108
    0.047 = 0.2493ln(x) + 0.108
    6.4% = 24%a + 24% + a
    x^2/（0.05-x）=1.8×10^-5
    0.5xxxx-xxx/3=0.15
    x2/（0.05-x）=1.8×105

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