chào tôi là Nguyễn Văn Minh , thông thạo 10 môn võ : karate , kiếm đạo , quyền anh,.... Trưởng nhóm đầu gấu trường Trường THCS Quang Hanh biệt danh của tôi là Arsène Lupin
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chào bạn, tôi tên là Lâm, tôi năm nay 8 tuổi. em học lớp 3a2, Trường Tiểu học Lê Văn Tám
hello, My name is lam, I'm eight.I'm in grade 3a2,Le Van Tam Primary School
Hi, I'm Thao. I'm 10 years old and I'm from grade 5C. Hung Binh Primary School is on Nguyen Xuan On street. My favorite is Music. I playing guitar and piano and poking out. I also listening to Korean and ang music. My family has 4 people, my father, my mother, my daughter and I. My father is 43 years old, working as a construction manager. My mother is 38 years old and currently I was still a 7-year-old student who also attended Hung Binh Primary School
Hi, I'm Thao. I'm 10 years old and I'm from grade 5C. Hung Binh Primary School is on Nguyen Xuan On street. My favorite is Music. I playing guitar and piano and poking out. I also listening to Korean and ang music. My family has 4 people, my father, my mother, my daughter and I. My father is 43 years old, working as a construction manager. My mother is 38 years old and currently I was still a 7-year-old student who also attended Hung Binh Primary School
Học tốt !
Ta có : 5A = 5 + 5^2 +...+ 5^51
=> 5A - A = 4A = 5^51 - 1
=> A = \(\frac{5^{51}-1}{4}\)
thì sao ???