1. My mother has long black hair

2. Nga is going to visit Nha Trang this summer vacation

3. Is he reading books now?

4. Minh often goes swimming in the summer

Gọi đố phải tìm là abcde4. Theo đề bài, ta có:

abcde.4 . 4 = 4abcde

=> (abcde.10 + 4) . 4 = 400000 + abcde

=> abcde . 40 + 16 = 400000 + abcde

Cùng bớt 2 vế đi abcde + 16. Ta được:

abcde . 39 = 399984

=> abcde = 399984 : 39

=> abcde = 10256

Vậy số phải tìm là 102564

1. I have never seen anyone more beautiful than your wife

2. I was meet your husband this afternoon at the station

1.has

2.is going to visit

A.flowers

a-b=7

(a-b)²=a²+b²-2ab=49

a²+b²+4ab-2ab=49+32=81

(a+b)²=81

a+b=9  hoặc a+b=(-9)

a quarter of seven