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x=[2:1,2,1,EEE]
y=[0:2,2,1,2,1,EEE]
x-1=3
y=1/(2+1/x)=x/(2x+1)=(3+1)/(23+3)(3+1)(23-3)/3
=(6-3-3)/3=1-1/3
x+y=(6+23)/3
x=[2:2,2,1,2,1EEE]
y=[0:1,2,1,2,EEE]
y=3-1
x=2+1/(2+1/(3+1)=2+(3+1)/(23+3)=2+(3+1)(23-3)/3
=2+(3-3)/3=3-1/3
x+y=2+3-1/32+23/3(6+23)/3