Digital devices play an essential part in teenagers' lives nowadays. I strongly believe that parents should not strictly limit their children's screen time for the following reasons.

First of all, using digital devices too much can harm teenagers’ health. Long hours in front of screens may cause eye strain, tiredness, and less physical activity. This makes them weaker and less focused in daily life.

Besides, too much screen time can affect their studies. Many students spend more time on games or social media instead of doing homework. Limiting screen use helps them study better and use their time wisely. In conclusion, parents should control their children’s screen time to protect their health and help them develop good study habits.

def UCLN(a, b):

if b == 0:

return a

return UCLN(b, a % b)

a = int(input())

b = int(input())

print(UCLN(a, b))

a = float(input())

while a <= 0:

print("Số vừa nhập chưa phải số thực dương. Hãy nhập lại.")

a = float(input())

print(f"{a**2:.2f}")

- Chương trình có lỗi cú pháp.

- Mã lỗi là SyntaxError.

- Lí do gặp lỗi: Câu lệnh if sai cú pháp. Cụ thể, thiếu dấu hai chấm cuối câu.

- Cách khắc phục: Thêm dấu hai chấm vào cuối dòng lệnh if (dòng 3).