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2a = 21 cm
21 cm: 2 = 10,5 cm
Odpowiedź : b) 10 1/2
2a=15+6
2a=21/:2
a=10½
czyli odpowiedź b) 10 1/2
2a = 15 + 6
2a = 21 / 2
a = 10 / ½
odp. b