Cho n là số tự nhiên. Chứng minh

A= 5²ⁿ⁺¹+2²ⁿ⁺⁴+2²ⁿ⁺¹ chia hết cho 23

Nhớ giải bằng đồng dư thức nha !

Tìm x thuoc Z biet:

(x^2 +2)(x-6)<0

dat lai cau hoi bang in spite of

-although the heat was turned all the way up, the house was still cold

-Keith decided to quit his job although t advised him not to do so

cac so nguyen a,b phai thoa man dieu kien gi de

a+b=-(/a/+/b/) a+b=/b/-/a/ a+b=-(/b/-/a/)

a+b=/a/-/b/ a+b=-(/a/-/b/)

cac so nguyen a,b phai thoa man dieu kien gi de

a+b=-(/a/+/b/) a+b=/b/-/a/ a+b=-(/b/-/a/)

a+b=/a/-/b/ a+b=-(/a/-/b/)