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U2 = a + b = 6
_____________ -
= 5b = 25
= b = 25 : 5
= b = 5
@ U2 = a + b = 6
= a + 5 = 6
= a = 6-5
= a = 1
• U10 = a + 9b
= 1 + 9 x 5
= 1 + 45
= 46 (D)