Soal soal asli CPNS berdasarkan FR | Paket 2 | TIU | No 30

Jika – 10 ≤ x + y ≤ 10 dan – 5 ≤ x ≤ 5, maka …
a. 0 ≤ xy ≤ 25
b. – 10 ≤ x – y ≤ 0
c. 0 < – x + y ≤ 25
d. – 25 ≤ xy ≤ 25
e. – 1 ≤ x/y ≤ 1

Jawaban : d
Karena – 10 ≤ x + y ≤ 10 dan – 5 ≤ x ≤ 5, maka – 5 ≤ y ≤ 5. Akibatnya, – 25 ≤ xy ≤ 25.

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