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Kelas 8 MatematikaBab Barisan dan Deret Bilangan
a] Bilangan pertama = 2a
Bilangan kedua = 2a + 2
Bilangan ketiga = 2a + 4
b] 2a + 2a + 2 + 2a + 4 = 126
6a = 126 - 6
2a = 120/3
2a = 40
2a + 2
= 40 + 2
= 42
2a + 4
= 40 + 4
= 44
40, 42, 44