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
    0.413x^2-2.239x+0.826=0
    413x^2-1826x+413=0
    x^2+2x+2=0
    2.95=x/（1-x）^2
    2.95=x/（1-x）2
    sinx+0.36*cosx=0.16
    -0.5*sinx+0.85*cosx=1.05
    0.5*sinx-0.8*cosx=1
    0.235 = -0.0009x2 + 0.0178x + 0.1168
    0.5sin(2*x)-0.8cos(2*x)=1
    3（X+5）=4X+5
    1/(1+x)+1/(1+x)^2+1/(1+x)^3+1/(1+x)^4+1/(1+x)^5=0.75
    1/(1+x)+1/(1+x)^2+1/(1+x)^3=0.75
    1/(1+x)+1/(1+x)^2=0.75
    3X+15=4X+5

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