1 . Viết được bao nhiêu số chẵn có 3 chữ số khác nhau từ 6 số 1,2,3,4,5,6 .Ai làm nhanh mình sẽ tick , nhớ là cách làm phải dễ hiểu và nhanh nhất nhé !

Cho biểu thức A = 7^2 + 7^4 + 7^6 + 7^8

a, Chứng tỏ A chia hết cho 5

Help me!

Tìm x:

\(x^2\) = 5.x

Có 3 anh em có tổng số tuổi là 58 tuổi, biết rằng 3/4 số tuổi em út bằng 2/3 số tuổi anh hai và bằng 1/2 số tuổi anh cả. Hỏi mỗi người bao nhiêu tuổi?

Từ sáu chữ số 0; 1; 2; 3; 4; 6, hãy chọn năm chữ số khác nhau điền vào năm ô trống để có:

x 5 : = 2010

Giúp mk nhé Mai

CMR: Nếu 30a + 2b chia hết cho 23 thì 7a - 21b chia hết cho 23

Trình bày đầy đủ hộ mình nha.

cho n thuộc N .CMR.6n+5 và 4n+3 là hai số nguyên tố cùng nhau

Mong các bạn giúp mik sớm :

+ a, 121 - 2 . ( x + 6 ) = | -11 | . 2017 \(^0\)

b, 2 . | x - 1 | - (- 3 ) = 3\(^{2017}\) : 3\(^{2016}\)

c, 5 + 2 . x = 17

d, x\(^3\) - 2 = 6

+ ) Trên tia Ox vẽ 3 điểm A, B và C sao cho OA = 4 cm ; OC = 8 cm.

a, Tính AB và BC

b, Điểm B có là trung điểm của đoạn thẳng AC không ? Vì sao ?

c, Lấy điểm M không thuộc Ox sao cho OM = 3 cm

+ ) Chứng minh abcabc ( có gạch ngang trên đầu ) chia hết cho 7, 11 và 13.

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Tập hợp C = { 8 ; 10 ; 12 ; ... ; 30 } có ( 30 - 8 ) : 2 + 1 = 12 phần tử

Tổng quát :

- Tập hợp các số chẵn từ số chẵn a đến số chẵn b có ( b - a ) : 2 + 1 phần tử

- Tập hợp các số lẻ từ số lẻ m đến số lẻ n có ( n - m ) : 2 + 1 phần tử

Hãy tính số phần tử của các tập hợp sau

D = { 21 ; 23 ; 25 ; ... ; 99 }

E = { 32 ; 34 ; 36 ; ... ; 96 }

cho số tự nhiên ab bằng 3 lần tích các chữ số của nó. Giả sử b = ak. Chứng minh rằng k là ước của 10

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