Số 5 chăng ?

Gọi số thứ nhất là x, số thứ 2 là x + 1
Có x . (x +1) = 111222
<=> x² + x = 111222
Cộng cả 2 vế với 1/4, ta có :
x² + x + 1/4 = 111222,25
<=> x² + 2 . 1/2.x + (1/2)² = 111222,25 (xuất hiện hằng đẳng thức)
<=> (x + 1/2)² = 111222,25
<=> x + 1/2 = 333,5
<=> x = 333
Vậy số thứ nhất là 333, số thứ 2 là 334. Tích 2 số này bằng 111222
Còn lại mỏi tay quá , tự làm nhá !

Ta có: 2 x 2,6 < 7
3 x 2,6 > 7
4 x 2,6 > 7
5 x 2,6 > 7
Mà x bé nhất do đó x = 3

The house I am living in is situated in the suburb of Hanoi city, within thirty minutes drive off the city center. We have lived there for more than twenty years. This is a fairly large house surrounded with a beautiful garden.

My house consists of four bed-rooms, a living-room, a bathroom with a shower, a dinning-room, a kitchen and a toilet. It is air-conditioned and well-furnished. The living-room is decorated beautifully. Paintings by famous artists are hung on the walls. At night, the color neon lights increase the beauty and coziness of the room. There, on Sundays and holidays my father usually spends his time playing chess or drinking tea with his friends. My mother and my younger sisters are kind and hard-working women. They often keep the house clean and tidy.

On hot days of summer, we usually take meals in the garden, under a big tree. It is fairly cool and quiet here. We enjoy our meals in the melodious twitters of birds. On stormy and rainy nights, all family members gather in the living-room, watching television or telling each other about their daily activities.

I love my house very much because it is the place where I was born and have grown up in the education of my father and in the tender loving care of my mother. I have spent my whole childhood in the love and affection of my dear ones with so many sweet memories.

CÓ VẺ DÀI ĐÓ . , FIGHTING ! DÙ sao thì tick hộ nhớ !
 

1 :T
2: T
3: F
4: T
5: F
Tick hộ !

1 : C
2 : B
3 :D
4:D
5:A
6D
7:A
8:A
9:D
10:D
Tick hộ !

Vì 1995 chia hết cho a và 1998 chia hết cho a
⇒a = 1 hoặc a = 3
từ đó b = 1995 ; c = 1998 hoặc b = 665 ; c = 666
Tick hộ !!!