tấm vải thứ nhất 63m

tấm vải thứ hai 81m

tấm vải thứ ba 90m

This festival is Ooc bom boc. It’s held by our ethnic group in Soc Trang on the 14^th and 15^th evenings of the 10^th lunar month. We worship out Moon God at the festival. We thanks him because he gives us good harvest and plenty of fish in the rivers.

There are many activities: first we have a worshipping ceremony at home, under the bamboo archway or at the pagoda. When the moon appears, the old pray to the Moon God and the children raise their elapsed hands to the moor. The offerings are green rice flakes, coconuts, potatoes and pia cakes. Then we float beautiful paper lanterns on the river, and the next evening, we hold thrilling dragon boat races.

- Do not have much money → It's hard to buy uniforms

- Feel constrained.

(x+2)+(x+4)+...+(x+52)=780

(x+x+...+x)+(2+4+...+52)=780

26x+702=780

26x=780-702

26x=78

x=78/26

x=3

a,Chu vi hình chữ nhật là:

(25 +15) x 2=80(m)

Chu vi hình vuông là:

21 x 4=84(m)

b,Ta thấy chu vi hình vuông lớn hơn chụ vi hình chữ nhật và lớn hơn số cm là:

84-80=4(cm)

tick nha Huy Tuân

trời ơi, bn hc nhah wa j, mk ms hc sách tập 1