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k²=4,5:72
k²=0,0625
k=√0,0625
k=0,25
odp. skala podobieństwa mniejszej figury do wiekszej wynosi 0,25, czyli ¼
3/4u - 1/3 u = 2 +1
9/12u - 4/12u = 3
5/12u = 3 | *12
5u = 36 |:5
u = 7,2