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a = 23 , U9 = a + 8b = 59
23 + 8b = 59
8b = 36
b = 36/8 = 9/2 cm
a) beda tiap potongan b = 9/2 cm
b) U6 = a + 5b
= 23 + 5(9/2)
= 23 + 45/2
= 23 + 22,5
= 55,5 cm