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Tingkat : SMP
Materi : Teori Bilangan
Pembahasan :
a , a + 1 , a + 2
Jumlah ketiganya = 21
a + a + 1 + a + 2 = 21
3a + 3 = 21
3a = 18
a = 6
a + 1 = 6 + 1 = 7
a + 2 = 6 + 2 = 8
Maka ketiga bilangan itu adalah 6,7,8