x^4÷5
    n+0.01n=200000
    x^4+4x+1=0
    1/x+2/x=x+1
    y=3½
    -1.125= 1/xln(1-x)
    -1.092 = 1/xln(1-x)
    -1.12= 1/xln(1-x)
    -1.083=1/xln(1-x)
    -1.092=1/xln(1-x)
    -1.12=1/xln(1-x)
    -3x+4=7x+24
    -1.083=1/xln(1-x)
    800 = 400÷(1+r)+300÷(1+r)^2+300÷(1+r)^3
    3100x-0.6x²＝3187500+600x-0.2x²
    x^2+3
    （1000-X）*0.04+X*0.005=(1000-X)*0.028
    （1163649237-X）*0.04+X*0.005=(1163649237-X)*0.028
    x+4+20+15%x+（x+15%x）*13%=2600
    (6-x)*(100+200x)=300

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