Tính nhanh :
a> 1 + 4 + 7 + ... + 304
b> 1 + 5 + 9 + ... + 481
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a; \(\dfrac{3}{11}\) + \(\dfrac{5}{-9}\) + \(\dfrac{4}{11}\) - \(\dfrac{4}{9}\) + \(\dfrac{3}{17}\) + \(\dfrac{15}{11}\)
= (\(\dfrac{3}{11}\) + \(\dfrac{4}{11}\) + \(\dfrac{15}{11}\)) - (\(\dfrac{5}{9}\) + \(\dfrac{4}{9}\)) + \(\dfrac{3}{17}\)
= 2 - 1 + \(\dfrac{3}{17}\)
= 1 + \(\dfrac{3}{17}\)
= \(\dfrac{20}{17}\)
c; N = \(\dfrac{\dfrac{5}{7}-\dfrac{5}{9}-\dfrac{5}{11}}{\dfrac{15}{7}+\dfrac{15}{9}+\dfrac{15}{11}}\)
Phải là - \(\dfrac{5}{7}\) chỗ tử số mới đúng em nhé!
6:50=> It's ten to seven.
7:50=> It's ten to eight
8:35=> It's twenty-five to nine.
9:00 => It's nine o'clock.
10:15=> It's a quarter past ten
11:25=> It's twenty-five to eleven.
1:30=> It's half past one.
3:45=> It's fifteen to four
4:5=> It's four five.
6:20=> It's twenty to six
9:45 => It's fifteen to ten
3:50=> It's ten to four.
7:15=> It's a quarter past seven
5:5=> It's five five
11:30=> It's half past eleven
1:35=> It's one thirty-five
4:20=> It's four twenty
bn ơi hình như đề sai
A=1=2=3-4-5-6+7+8+......... ......-101-102
mk thấy đề bài hơi lạ tại sao 1=2 đc nhỉ ??????
trả lời
1 + 1 + 2 + 2 + 3 + 3 + 4 + 4 + 5 + 5 + 6 + 6 + 7 + 7 + 8 + 8 + 9 + 9 + 10 + 10
=110
hok tốt .