Khang Nguyễn Văn Minh
Giới thiệu về bản thân
Ko bt nói sao nx :D
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2025-01-09 21:15:33
so sánh
2025-01-09 21:13:33
17.5
2024-08-28 15:36:30
2024-08-28 15:36:30
2024-08-28 15:36:30
2024-08-28 10:54:05
x + ( x + 1 ) + ( x + 2 ) + ( x + 3 ) + ... + ( x + 20 ) = 399
x * ( ( 20 - 1 ) : 1 + 1 + 1) + ( ( 20 + 1 ) * ( ( 20 - 1 ) : 1 + 1 ) : 2 ) = 399
x * 21 + 210 = 399
x * 21 = 189
x = 189 : 21
x = 9
Xong nha bạn !