160 = 2⁵.5

160 = 32 . 5 = 4 . 8 . 5

                    = 20 . 8

                    = 4 . 40

Nếu a = 20 và b = 8 thì BCNN ( a;b) = 2³.5 = 40 ( T/ mãn)

Nếu a  = 4 và b = 40 thì BCNN ( a;b) = 2³.5 = 40 (T/ mãn )

Nếu 4 = 32 và b = 5 thì BCNN (a;) = 2⁵.5 = 160

Vậy ta có bảng sau

Give the correct form of the verbs in brackets (Past simple or past continuous).

1. I (call) ___ Mr Wilson at 9 last night, but he (not be) ___ at home. He (study) ___ at the library.

2. I (not hear) ___ the thunder during the storm last night because I (sleep) ___.

3. It was beautiful yesterday when we went for a walk in the park. The sun (shine) ___. The birds (sing) ___.

4. My brother and sister (talk) ___ about something when I (walk) ___ into the room.

5. Tom went to his friends' house, but the boys (not be) ___ there. They (play) ___ soccer in the vacant lot down the street.

6. The little boy (fall) ___ asleep while his mother (read) ___ him a story.

7. I really enjoyed my holiday last January. While it (snow) ___ in lowa, the sun (shine) ___ in Florida.

8. While Ted (shovel) ___ snow from his driveway yesterday, his wife (bring) ___ him a cup of hot chocolate.

9. John (have) ___ a car accident last week. He (drive) ___ down the street when suddenly a lorry (hit) ___ his car from behind.

10. Ten years ago, the government (decide) ___ to begin a food programme. At that time, many people in the rural areas (strarve) ___ due to several years of dought.

11. They (wait) ___ for me when I (arrive) ___ at the station.

12. She (swim) ___ in the sea when I (see) ___ her.

13. ___ they ___ (play) tennis when it (start) ___ raining?

14. We (drive) ___ home from the theatre when the police (stop) ___ us.

15. The wind (blow) ___ very hard when I (go) ___ out this morning.

Mọi người giúp mình với nha! Thank you very muchhh !!

\(0,5x-\frac{2}{3}x=\frac{7}{12}\)

\(\frac{1}{2}x-\frac{2}{3}x=\frac{7}{12}\)

\(\left(\frac{1}{2}-\frac{2}{3}\right)x=\frac{7}{12}\)

\(\frac{-1}{6}x=\frac{7}{12}\)

\(x=-21\)

b,c,d tương tự

ngu như chó

\(2x^2+2y^2\)

\(=2\left(x^2+y^2\right)\)

Đặt nhân tử chung thôi 

T nha

ta có

\(P=\frac{27-2x}{12-x}\)

\(P=\frac{\left(12-x\right)+\left(12-x\right)+3}{12-x}\)

\(P=2+\frac{3}{12-x}\)

để P lớn nhất thì \(\frac{3}{12-x}\) phải lớn nhất

=> 12-x phải bé nhất (hay 12-x=1)

=> x=12

Bây giờ thay vào sẽ có kết quả là 5

=> P lớn nhất bằng 5

(C)Số tự nhiên bất kì

k mk nha các bạn

(x - 2).(x + 3) < 0

=> x - 2 và x + 3 là 2 số trái dấu

Mà x - 2 < x + 3

=> x - 2 < 0 và x + 3 > 0

=> x < 2 và x > -3

=> -3 < x < 2

Mà x thuộc Z => x thuộc { -2 ; -1 ; 0 ; 1}

Vậy x thuộc { -2 ; -1 ; 0 ; 1}