A=3+5+7+9+...+99
A=?
calculate in many ways
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a) Calculate:1 + 3 + 5 + ...... + 57 = .....
b) Calculate:3 - 1 + 5 - 3 + 7 - 5 + ... + 99 - 97 =....
Mình chỉ biết làm phần a thôi à :
a , Dãy trên có số số hạng là :
( 57 - 1 ) : 2 + 1 = 29 ( số hạng )
Vậy tổng của tất cả các số lẻ từ 1 đến 57 là :
( 57 + 1 ) x 29 : 2 = 841
Đáp số : 841
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I'm sorry to say that I don't see any mathematical expressions. And you should translate your questions into Vietnamese so all people can answer them.
I am very sorry but I cannot see any numbers to answer your questions
mình ko hiểu tại sao ko ai chịu giúp bạn cả,nhưng mình sẽ giúp bạn nhưng bạn phải
bài này dễ tính lắm,đáp án là 51
Viết sai chữ " máy tính " rồi kìa, phải là calculator chứ không phải calculate .
The country is (1)........more.....beautiful than a town and more pleasant to live in. Many people think so, and go to the country (2) .....on..... the summer holiday though they can't live (3) ...there.......... all the year round. Some have cottage built in a village (4) ....so...... that they can go there whenever they (5) ......have....find the time.
English villages are not alike, but (6)............. some ways they are not very different from (7) ...................other. Almost every village (8) ...........a church, the round or square tower of which can (9) ............seen from many miles around. Surrounding the church is the church yard, (10).......... people are buried.
The country is (1).......more......beautiful than a town and more pleasant to live in. Many people think so, and go to the country (2) .....on..... the summer holiday though they can't live (3) ....there......... all the year round. Some have cottage built in a village (4) .....so..... that they can go there whenever they (5) .....have.....find the time.
English villages are not alike, but (6)....in......... some ways they are not very different from (7) .......each............other. Almost every village (8) .......has....a church, the round or square tower of which can (9) ........be....seen from many miles around. Surrounding the church is the church yard, (10)......where.... people are buried.
The number of A's is:
(99-3): 2 + 1 = 49 (term)
=> A = (99 + 3) * 49: 2 = 2499
Dress......
A = 2499