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8 pier. z 3 =6 pier z 3*r
6 pier z 3*r=8 pier. z 3
r=8 pier. z 3/6 pier z 3
r=1i1/3
b) 18 pier z 3 = 9 +6pier. z 3 *r
18 pier z 3 = =15pier z 3*r
15pier z 3*r=18 pier z 3
r=18 pier z 3 /15pier z 3*
r=1,2