2414 chia 6
NH
Những câu hỏi liên quan
2414+414+141
=
=
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Tìm x
a, 12,5 x 4 - x = 4,3+2,6
b, ( x = 0,9 )x( 1 - 0,4 ) = 2414
a, 12,5 x 4 - x = 4,3+2,6
50 - x = 6,9
x=50-6,9
x=43,1
câu b sao lại bằng 0,9 z
1. CMR: 7n3+2009: 21 với mọi n thuộc Z
2. CMR: n là số nguyên lẻ thì B=n3+3n3n+2414 : 8
3. CMR:
A=n3 +11n11n+2016 : 6 với n thuộc Z
4. CMR: Với mọi n thuộc Z+
A=32+23n-2nn+6 : 7
Exercise: Read the text and do the task below:
Teenagers need lots of energy because theyre 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 k...
Đọc tiếp
Exercise: Read the text and do the task below:
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 figures are only a guide. Young people may need more or less energy. Teenagers should eat a healthy, balanced diet because the amount of enrgy they need is important.
The best tile for the text is........
A. A healthy and balanced diet.
B.Do teenagers need energy?
C.How many calories do teenagers needs?
Exercise: Read the text again and complete the sentences:
Teenagers need lots of energy because theyre 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...
Đọc tiếp
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..................
2.Kcal is contained..............
3.A report showed that at the same age, boy used.................... than a girl.
4.The report was written in...................
5.The table is about................. of children aged 13-18 .
6.As a teenager get older, he or she needs..................
7.The report gave the figures as.................
8.Teenagers should eat.....................
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.
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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
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Đặt tính rồi tính
Xem chi tiết
28,167+4,05 69,42-15,9 34,65×2,5 206,4:3,2
2.Tính giá trị biểu thức
128-0,5×(12-11,7)
3. Tìm x
X ×25=12,64+18,61
4. Tính chu vi của sân trường HCN, biết diện tích sân trường là 2414 m2 và chiều rộng 42,5m.
cho a,b,c,d là các số tự nhiên. Biết a chia cho 6 dư 1 , b chia cho 6 dư 2 , c chia cho 6 dư 3 , d chia cho 6 dư 4 . Chứng minh rằng abcd chia hết cho 6
Chứng minh rằng : a, M = 21^9+21^8+21^7 +....+ 21+1 chia hết cho 2 và 5 b, N = 6+6^2+6^3 +....+ 6^2020 chia hết cho 7 nhưng không chia hết cho 9 c, P = 4+4^2+4^3 +....+ 4^23+4^24 chia hết cho 20 và 21 d, Q = 6+6^2+6^3 +....+ 6^99 chia hết cho 43
Hộ mình làm bài này nhá :))))))))
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) \(Q=6+6^2+6^3+...+6^{99}\)
\(Q=6.\left(1+6+6^2\right)+...+6^{97}.\left(1+6+6^2\right)\)
\(Q=6.43+...+6^{97}.43\)
\(Q=43.\left(6+...+6^{97}\right)⋮43\)
\(\Rightarrow Q⋮43\)
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cho a-b chia het cho 6
chung to rang
(a+5b) chia het cho 6
(a+17b) chia het cho 6
(a+13b) chia het cho 6
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.....
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