nguyễn ngọc linh
Giới thiệu về bản thân
tạo acc vì rảnh,
giải bt để kiếm điểm!
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2024-06-18 14:50:38
0,75=75 %
2024-04-14 11:43:46
không á
2024-04-13 22:16:57
2024-04-13 22:14:21
1. do
2.will
2024-04-13 22:09:22
2024-04-13 22:07:34
2024-04-13 22:06:35
2024-04-13 21:53:10
bạn nhớ vote cho mình nhaa
2024-04-13 21:52:11
2023-12-26 13:01:02
Đặt A=35+34+...+31+30
3A-A=36+35+...+32+31-35-34-...-31-30
2A=36-30=>A=\(\dfrac{3^6-3^0}{2}\)
Thay A vào M ta có:
M=36-\(\dfrac{3^6-3^0}{2}\)
M=\(\dfrac{2.3^6}{2}\)-\(\dfrac{3^6-3^0}{2}\)
M=\(\dfrac{3^6.\left(2-1\right)-1}{2}\)
M=\(\dfrac{3^6.1-1}{2}\)
M=\(\dfrac{3^6-1}{2}\)
M=364