Bài 1 : Cho số tự nhiên n , chứng minh n\(n^2+n+1̸̸\) không chia hết cho 5

Bài 2 : Chứng minh với n \(\in\) N thì các số sau \(⋮\) 9

a, \(10^n-1\)

b, \(10^n+8\)

Bài 3 : Chứng minh \(942^{60}-3^{60}-351^{37}⋮5\)

làm được mình tích cho

Tìm x :

\(2^{x+1}-2^x=32\)

Fill each blank in the following passage with a suitable word from the box .

An's bedroom is big but messy . There (1) .......... clothes on the floor . There is a big desk (2) .......... the window , and there are dirty bowls and chopsticks (3) .......... it . He usually puts his (4) .......... under the desk . His bed is (5) .......... to the desk , and it is also (6) .......... . There is a cap , some CDs and some books on the bed . An's mum is (7) .......... happy with this , and now An is tidying up (8) .......... room .

HELP ME !!!!!

( Làm đúng tớ tích cho ❤ )

Give the corect verb forms : Present simple or present continuous tenses :

Thanh and I ( be ) .......... at home now .

Hung ( run ) .......... about 5 km every morning .

Hung and Minh sometimes ( meet ) .......... each other ?

Every evening , she ( jog ) .......... about 3 km .

He always ( drive ) .......... his car to work . But now , he ( ride ) .......... his motorbike to work

HELP ME !!!!!

( Làm đúng tớ tích cho )

Give the corect verb forms : Present simple or present continuous tenses :

Mi and Thanh ( talk ) .......... on the telephone now ?

They ( plant ) .......... trees in the early year .

He ( not study ) .......... Math at the moment .

She ( play ) .......... badminton every afternoon ?

They sometimes ( do ) .......... morning exersices at 5.30 .