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t = 6 cm
a + b = 38 - 2t
a + b = 38 - 12
a + b = 26 cm
a = b + 2t
b + 2t + b = 26
b + 12 + b = 26
2b = 14
b = 7
a = 7 + 12 = 19
odp: podstawy tego trapezu maja 7 i 19 cm.