k minh minh giai

LÀ 2 ĐẤY

Health and hygiene are very important. So Nam always takes care of his health. He does morning exercise regularly and eats moderately. He brushes his teeth after meals everyday. He doesn’t eat candy at night. Nam doesn’t stay up late. He often goes to bed at 10 o’clock and gets up at 6 o’clock. He likes watching cartoons but he never sits near TV. It is not good for his eyes. He will always keep his teeth clean and his body fit. Health is more important than anything else!

1.Why does Nam take care of his teeth?

\(\rightarrow\) He does morning exercise regularly and eats moderately.

2.What does he do after meals?

\(\rightarrow\) He brushes his teeth after meals,

3.What doesn’t he eat at night?

\(\rightarrow\) He doesn't eat candy at night.

4.What time does he sleep?

\(\rightarrow\) He often goes to bed at 10 o'clock.

5.Why does he never sit near TV?

\(\rightarrow\) Because it is not good for his eyes.

Giải

\(\frac{12}{12}+\frac{12}{12}\)

\(=1+1\)

\(=2\)

\(\frac{3^{-m}}{81}=27\)

\(3^{-m}=27.81\)

\(3^{-m}=3^3.3^4\)

\(3^{-m}=3^{3+4}=3^7\)

\(\Rightarrow-m=7\)

\(\Rightarrow m=-7\)

Vậy \(m=-7\)

Tổng số học sinh lớp 4a và lớp 4e :

27 + 33 = 60 ( học sinh )

Số quyển vỡ mỗi học sinh mua:

720 : 60 = 12 ( quyển )

Số quyển vỡ lớp 4a mua:

12 x 27 = 324 ( quyển )

Số quyển vỡ lớp 4e mua:

12 x 33 = 396 ( quyển )

bài này mk tự lm ko copy bài ở dưới

NHẰM ; ĐÁP ÁN LÀ ;256

bn co chc chan la dung ko Barack Obama

số cam là

500x 49,4:100=247 ( cây)