-_- ?????

?????????

có 3 trục đi qua tâm các mặt đối diện nhau,

6 trục đi qua trung điểm các canh đối diện nhau

4 trục đi qua các đỉnh đối diện nhau

Vậy có \(3+6+4=13\text{ trục}\)( không có đáp án)

Bạn có nhầm với mặt đối xứng không nhỉ, nếu là mặt thì sẽ có 9 mặt nhé

Có  mười ba nha !! 13 góc !! 

có 13 trục nha bạn cho xin 1

Teleport

ước tính khoảng hơn 7,8 tỉ người

Khoảng 7 tỷ người.

@Cỏ

#Forever

X  = 0-1

X  = -1

kkkkk

chúc bn hok tốt

chúc bn hok tốt nhé :3

Em viết phần intro nha:

The chart above decsribes how the birth rates of 2 countries namely China, USA changed in 80 years which started from 1920

Answer:
The line graph compares the birth rates in China and the US and how these rates changed from 1920 to 2000.
Overall, there was a general decline in fertility of both nations throughout the time surveyed. However, the US’s birth rates almost was higher than that of China over the whole period.
American saw a significant fluctuation in the birth rates between 1920 to 1935, but it always remained over 10%. However, in the following decade, the fertility of the US decreased sharply to under 5 %. From 1945 to 1950, there was a rapidly increased in American’s birth rates, at 15%, reaching the highest point of it’s own during the whole period. From that on, the fertility of the US fell gradually to 7% in 2000.
During the 80-year period, the birth rates in China changed more significantly than in the US. It fell down to 5% in the year 1940, then reaching a peak of whole line graph in 1950, at 20%. Over the remainder of the period, China saw a sharply drop in the birth rates to only about 2% until 2000.

tương lai

ngày mai!bn lên gg mà tra!

cảm ơn các bn 

nhầm nha bn sorry bn rất nhiều