a) đội 2 làm được nhiều nhất (tương ứng 9/27 công việc).

đội 3 làm được ít nhất (tương ứng 5/27 công việc)

b) nếu làm chung, mỗi giờ cả ba đội làm được 20/27 công việc

a):1/4,b):15/16,c):3

a):4/21,b):0,c)-5/6

Vì CNL(n-1,n-2)=1 với mọi n∈ Z, n/=, lên phân sốM=n-1/n-2 là phân số tối giả.

1.

Các bộ 3 điểm thẳng hàng là:ABF, DEB, CEF

2.

a) vậy đoạn thẳng IB=5 cm

b) Vậy đoạn thẳng AE = 6,5 cm

Chiều dài đám đất:

60×4/3=80 m

Diện tích đám đất:

60×80=4800 m²

Diện tích trồng cây :

4800×7/12=2800 m²

Diện tích phần còn lại :

4. 4800 - 2800 = 2000 m²

Diện tích ao thả cá :

2000 x 30% = 2000 x 0.3 = 600 m² ​​​​

​​​

a) - 2/11

b)161/36

a) >

b) =

a) > b) =

My favorite festival is the Tet Nguyen Dan, also known as the Lunar New Year, the most significant and important celebration in Vietnam. Tet usually spans about three official days, but the festive atmosphere often lasts for a full week, marking the beginning of a new year according to the lunar calendar and welcoming the arrival of spring. I love Tet not only because it is a rare opportunity for all family members to reunite, but also because of the rich cultural and spiritual values it brings. Everyone, regardless of how far away they work or study, tries their best to return to their hometowns to gather with family and loved ones. Before Tet, the whole family cleans and decorates the house with apricot and peach blossoms, and prepares traditional signature dishes like banh chung (sticky rice cakes) or braised pork with eggs. The process of making banh chung together, gathering around the pot, creates many warm and lasting memories. During the days of Tet, we engage in many exciting activities such as visiting relatives to exchange New Year's greetings, receiving lucky money (li xi), and visiting pagodas to pray for peace and good fortune for the family. To me, Tet Nguyen Dan is not merely a holiday; it is a symbol of family togetherness, cultural pride, and hope for a better new beginning. Every time I celebrate Tet, I feel deeply connected to my roots and cherish those precious moments spent with my loved ones.