9xX=48+15

9xX=63

X    =63:9

X    =7.

30

56

4

1. stamps / a child / Minh / since / collected / was / has / he.

- ...........................................................................................................................

2. tomorrow / can / not / we / somewhere / I / so / working / go / am.

- .............................................................................................................................

3. back / in / months / England / going / two / are / to / they.

- ...........................................................................................................................

4. information / entertainment / also / is / TV / only / but / not / bringing .

- ………………………………………………………………………………….

5. struggle / on / always / nature / home / life / at / is / the farm / with / a.

- ……………………………………………………………………………………

P/s : Help meeeeeee

toan,tan

số số hạng của dãy dó là :

( 100 - 2 ) : 2 + 1 = 50

tổng đó là :

( 100 + 2 ) x 50 : 2 = 2550

đáp số : 2550

tu thang 1 den thang 12 ngu nguoi