-9, 3, -1, .....
q=3/-9=-1/3
-9,3, -1, 1/3, - 1/9
-9*3*(-1)* 1/3*(-1/9)=(-9* -1/9)*(1/3*3)*(-1)=1*1*(-1)=-1
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-9, 3, -1, .....
q=3/-9=-1/3
-9,3, -1, 1/3, - 1/9
-9*3*(-1)* 1/3*(-1/9)=(-9* -1/9)*(1/3*3)*(-1)=1*1*(-1)=-1