a1=1/x
a2=(1/x)/x=1/x^2
a3=(1/x^2)/x=1/x^3
a4=(1/x^3)/x=1/x^4
y=(1/x)+(1/x^2)=(x+1)/x^2
y=(x^2+x+1)/x^3
y=(x^3+x^2+x+1)/x^4
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a1=1/x
a2=(1/x)/x=1/x^2
a3=(1/x^2)/x=1/x^3
a4=(1/x^3)/x=1/x^4
y=(1/x)+(1/x^2)=(x+1)/x^2
y=(x^2+x+1)/x^3
y=(x^3+x^2+x+1)/x^4