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12x - 20x ≤ 40+8
-8x ≤ 48
x ≤ 48:-8 = 6
jadi x ∈ bil. asli = (1,2,3,4,5,6)
2. a = 1, 2, 3, 4, 6, 12
b = 2, 3, 5, 7, 11, 13
A П B =2 Dan 3
nomber 3 takut salah jawabnya juga :v
jumlah = (15-8) + 8 + (17-8)
jumlah = 7+8+9
jumlah = 24 siswa