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thi hue nguyen

cho abc chia het cho 3 va 7 

chung ta tong ( a + 19b + 4c ) chia het cho 3 va 7

 

Lớp 6 Toán Câu hỏi của OLM

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mai tiến dũng
mai tiến dũng
10 tháng 10 2017 lúc 19:54

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thi hue nguyen
thi hue nguyen
10 tháng 10 2017 lúc 20:43

ai tra loi duoc tui cho100k

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pham thanh canh

chung minh rang

a tong cua 3 so chan lien tiep thi chia het cho 6

b tong cua 3 so le lien tiep khong chia het cho 6

c neu a chia het cho b va b chia het cho c thi a chia het cho c

d neu a va b chia het cho 7 co cung so du thi hieu a-b chia het cho 7

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Lớp 6 Toán Câu hỏi của OLM
tran thi nguyet nga

chung to rang abc chia het cho 21 khi va chi khi a-2b+4c chia het cho 21

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Lớp 6 Toán Câu hỏi của OLM
nguyen quynh

1.chung minh rang neu ab+cd+eg (ab, cd eg la cac so co hai chu so) chia het cho 11 thi abcdeg chia het cho 11

2. cho abc-deg chia het cho 7( abc va deg la cac so co 3 chu so). chung minh rang abcdeg chia het cho 7

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Lớp 6 Toán Câu hỏi của OLM
My Khoi Tran

cho tong M=1+3+32+33+...+319

a) chung minh M chia het cho13, chia het cho 40 va ko chia het cho 9

b) tim chu so tan cung cua tong M

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Lớp 6 Toán Câu hỏi của OLM
do van hung

tim cac so co 3 chu so chia het cho 7 va tong cua cac chu so cua so do chia het cho  7

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Lớp 6 Toán Câu hỏi của OLM
Huỳnh Văn Hiếu

Chung to neu a2+b2 chia het cho 7 thi a chia het cho 7 va b chia het cho 7

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Lớp 6 Toán Câu hỏi của OLM
letrungyen

Cho a,b,c la 3 so tu nhien khac 0 va a+2b+30c chia het cho 7

      chung minh : 17a+13b+9c chia het cho 7

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Lớp 6 Toán Câu hỏi của OLM
Nguyen Trang

Tìm n biết:

a) 7 chia het cho n + 1 va n > 3

b) 15 chia het cho n + 3 va 7 < n <10

c) n + 7 chia het cho n + 3

d) 2n + 6 chia het cho n + 2

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Lớp 6 Toán Câu hỏi của OLM
Thuy Tien phung

Bài 1:

a) C/m: A=2^1+2^2+2^3+2^4+....+2^2010 chia het cho 3 và 7

b) C/m: B=3^1+3^2+3^3+3^4+....+3^2010 chia het cho 4 va 13

c) C/m: C= 5^1+5^2+5^3+5^4+....+5^2010 chia het cho 6 va 31

d) C/m: D=7^1+7^2+7^3+7^4+....+7^2010 chia het cho 8 va 57

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Lớp 6 Toán Câu hỏi của OLM

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