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ON
3
TM
5 tháng 7 2018
Exercise: Read the text again and complete the sentences:
Teenagers need lots of energy because they're still growing. Kilocalories (kcal) show the amount of energy contained in food and drinks.
A report in 2011cshowed that children aged 13-18 need the average daily energy as follows:
Age Boys Girls
13 2414 kcal 2223 kcal
14 2629 kcal 2342 kcal
15 2820 kcal 2390 kcal
16 2964 kcal 2414 kcal
17 3083 kcal 2462 kcal
18 3155 kcal 2462 kcal
However, those figutures are only a guide. Young people may need more or less energy. Teenagers should eat a healthy, balanced diet because th amount of energy they need is important.
1.Teenagers are growing, so they need lots of energy.
2.Kcal is contained in food and drinks.
3.A report showed that at the same age, boy used ???? than a girl.
4.The report was written in age of boys and girls.
5.The table is about of children aged 13-18 need the average daily energy
6.As a teenager get older, he or she needs more or less energy.
7.The report gave the figures as :
13 2414 kcal 2223 kcal
14 2629 kcal 2342 kcal
15 2820 kcal 2390 kcal
16 2964 kcal 2414 kcal
17 3083 kcal 2462 kcal
18 3155 kcal 2462 kcal
8.Teenagers should eat a healthy, balanced diet because th amount of energy they need is important.
Mk ko chắc là đúng nha!
VN
5 tháng 7 2018
Exercise: Read the text again and complete the sentences:
Teenagers need lots of energy because they're still growing. Kilocalories (kcal) show the amount of energy contained in food and drinks.
A report in 2011cshowed that children aged 13-18 need the average daily energy as follows:
Age Boys Girls
13 2414 kcal 2223 kcal
14 2629 kcal 2342 kcal
15 2820 kcal 2390 kcal
16 2964 kcal 2414 kcal
17 3083 kcal 2462 kcal
18 3155 kcal 2462 kcal
However, those figutures are only a guide. Young people may need more or less energy. Teenagers should eat a healthy, balanced diet because th amount of energy they need is important.
1.Teenagers are growing, so they need lots of energy
2.Kcal is contained in the food and drinks
3.A report showed that at the same age, boy used more than a girl.
4.The report was written in. 2011
5.The table is about the average daily energy of children aged 13-18 .
6.As a teenager get older, he or she needs more or less energy
7.The report gave the figures as age , boys and girls
8.Teenagers should eat.a healthy, balanced diet
11 tháng 6 2021
Giải:
a) \(M=21^9+21^8+21^7+...+21+1\)
Do \(21^n\) luôn có tận cùng là 1
\(\Rightarrow M=21^9+21^8+21^7+...+21+1\)
Tân cùng của M là:
\(1+1+1+1+1+1+1+1+1+1=10\) tận cùng là 0
\(\Rightarrow M⋮10\)
\(\Leftrightarrow M⋮2;5\)
b) \(N=6+6^2+6^3+...+6^{2020}\)
\(N=6.\left(1+6\right)+6^3.\left(1+6\right)+...+6^{2019}.\left(1+6\right)\)
\(N=6.7+6^3.7+...+6^{2019}.7\)
\(N=7.\left(6+6^3+...+6^{2019}\right)⋮7\)
\(\Rightarrow N⋮7\)
Ta thấy: \(N=6+6^2+6^3+...+6^{2020}⋮6\)
Mà \(6⋮̸9\)
\(\Rightarrow N⋮̸9\)
c) \(P=4+4^2+4^3+...+4^{23}+4^{24}\)
\(P=1.\left(4+4^2\right)+4^2.\left(4+4^2\right)+...+4^{20}.\left(4+4^2\right)+4^{22}.\left(4+4^2\right)\)
\(P=1.20+4^2.20+...+4^{20}.20+4^{22}.20\)
\(P=20.\left(1+4^2+...+4^{20}+4^{22}\right)⋮20\)
\(\Rightarrow P⋮20\)
\(P=4+4^2+4^3+...+4^{23}+4^{24}\)
\(P=4.\left(1+4+4^2\right)+...+4^{22}.\left(1+4+4^2\right)\)
\(P=4.21+...+4^{22}.21\)
\(P=21.\left(4+...+4^{22}\right)⋮21\)
\(\Rightarrow P⋮21\)
d) \(Q=6+6^2+6^3+...+6^{99}\)
\(Q=6.\left(1+6+6^2\right)+...+6^{97}.\left(1+6+6^2\right)\)
\(Q=6.43+...+6^{97}.43\)
\(Q=43.\left(6+...+6^{97}\right)⋮43\)
\(\Rightarrow Q⋮43\)
Chúc bạn học tốt!
TT
28 tháng 9 2015
a+5b=a-b +6b vì 6b chia hết cho 6 nên a+5b chia hết cho 6
Các phần còn lại làm tương tự
a+17b=1-b +18b.....
`2414 : 6 = 1207/3`
ko chia hết