Đáp án + Giải thích các bước giải:

- BM - TN - NĐK - Quang Minh

- Chúc em học tốt nhé 

- Cho anh 5 sao , cám ơn và hay nhất nhé

If we eat a lot and exercise little, we can become overweight, obese and possibly sick.

We can check this using an index called BMI based on weight (using kilograms) and height (using meters) of our body: BMI = weight: (height x height)

For an 11-year-old student, a normal BMI is around 17. A BMI above 19.5 is considered overweight, over 22 obese, underweight under 15.5 years old and malnourished under 14 years old.

a) An 11-year-old student, 1.5 m tall and 45 kg, has a BMI of:

BMI = 45 : ( 1.5 x 1.5 ) = 20

With the above BMI, can this student's physical condition be classified into any classification?

- With the above BMI, this student can be classified as overweight

b) With a height of 1.5 m, what weight must this student have to be considered normal?

- With a height of 1.5 m, the weight of this student must be: 17 x ( 1.5 x 1.5 ) = 38.35