Gửi:
A = { x∈n / a.a-a với a= 2;3;4}
→ liệt kê các phần tử:
⇒ a.a-a = 2; 3; 4
a.a-a = 2.2-2
= 2
a.a-a = 3.3-3
= 6
a.a-a = 4.4-4
= 12
Vậy A = { 2; 6; 12 }
Đáp án+Giải thích các bước giải:
`A={2; 6; 12}`
Vì `a=2; 3; 4`
`=> a.a-a=2.2-2=2`
`a.a-a=3.3-3=6`
`a.a-a=4.4-4=12`
Vậy `A={2; 6; 12}`
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