Đổi: 20 phút = \(\dfrac{1}{3}giờ\)

Gọi s (km) là quãng đường từ thành phố về quê (s > 0).

Thời gian từ thành phố về quê là: \(\dfrac{s}{30}+\dfrac{1}{3}\) (giờ)

Thời gian từ quê lên thành phố là: \(\dfrac{s}{25}\) (giờ)

Ta có phương trình:

 \(\dfrac{s}{25}\)= \(\dfrac{s}{30}+\dfrac{1}{3}\)

\(\dfrac{6s}{25.6}\)=\(\dfrac{5s}{30.5}+\dfrac{50}{3.50}\)

6s = 5s + 50

6s - 5s = 50

s = 50 (nhận)

Vậy quãng đường từ thành phố về quê là 50 km.

a/ 3x - 5 = 4          b/ \(\dfrac{2x}{3}+\dfrac{3x-1}{6}=\dfrac{x}{2}\)

    3x = 4 + 5             \(\dfrac{2x.2}{3.2}+\dfrac{3x-1}{6}=\dfrac{x.3}{2.3}\)

    3x = 9       

      x = \(\dfrac{9}{3}=3\)            4x + 3x - 1 = 3x

Vậy: S = {3}              7x - 1 = 3x

                                 7x - 3x = 1

                                  4x = 1

                                    x = \(\dfrac{1}{4}\)

                                Vậy: S = {\(\dfrac{1}{4}\)}

a/ 3x - 4 = 5 + x

    3x - x = 5 + 4

    2x = 9

      x = \(\dfrac{9}{2}\)

Vậy: S = {\(\dfrac{9}{2}\)}

b/ 3(x - 1) - 7 = 5(x + 2)

    3x - 3 - 7 = 5x + 10

    3x - 10 = 5x + 10

    (-10) - 10 = 5x - 3x

    -20 = 2x

     x = \(\dfrac{-20}{2}\)

     x = -10

Vậy: S = {-10}

The regulation to prohibit mobile phones in secondary schools is a topic of considerable debate. On one hand, mobile phones can be a significant distraction, potentially disrupting the learning environment and facilitating cheating. They can also contribute to social issues, such as cyberbullying. On the other hand, mobile phones are powerful tools for learning and communication, providing students with access to educational resources and a means to contact family in emergencies. Ultimately, the effectiveness of such a regulation depends on its implementation and the school’s ability to provide alternative resources. A balanced approach, where mobile phone use is regulated rather than completely banned, might serve to mitigate the drawbacks while still harnessing the benefits of technology in education.

While robots and AI can enhance educational experiences by providing personalized learning and instant feedback, they cannot replace the emotional intelligence, empathy, and motivational skills of human teachers. The role of teachers is not just to impart knowledge, but also to inspire, guide, and understand students’ diverse needs and backgrounds. Technology can be a powerful tool in education, but the human element is irreplaceable in fostering a nurturing and creative learning environment. Therefore, robots may become assistants in the classroom, but they will not replace the essential human touch that teachers provide.

While robots and AI can enhance educational experiences by providing personalized learning and instant feedback, they cannot replace the emotional intelligence, empathy, and motivational skills of human teachers. The role of teachers is not just to impart knowledge, but also to inspire, guide, and understand students’ diverse needs and backgrounds. Technology can be a powerful tool in education, but the human element is irreplaceable in fostering a nurturing and creative learning environment. Therefore, robots may become assistants in the classroom, but they will not replace the essential human touch that teachers provide.

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