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
    x/(x-72)=2
    x/(x-62)=2
    -4=-0.05x²＋0.455x-2.55
    -4=-0.05x＋0.455x-2.55
    xx-7x+12=0
    (x+9)/x=4
    10000/（x+99*0.12)+6700/(x+99*0.12)+10000/(x+99*0.12)+10000/(x+99*0.12)+10000/(x+99*0.12)=250
    10000/（x+99*0.12)+6700/(x+99*0.12)+10000/(x+99*0.12)+10000/(x+99*0.12)=250
    10000/（x+99*0.12)+6700/(x+99*0.12)+10000/(x+99*0.12)=150

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