1+2+3+4+5+...+99+100( có 100 số hạng)

=(1+100).100÷2

=101.50

=5050

Gau Xơ đã làm bài toán này như sau : 

Gau Xơ nhận thấy rằng cặp 2 số đầu và cuối , cũng như từng cặp 2 số cách đều số đầu và số cuối đều có tổng bằng 101.

Có 50 cặp như thế, do đó kết quả là : 101.50 = 5050

Nếu tôi giả bài toán này thì theo tôi là có 3 cách làm ( kể cả cách Gau Xơ làm thế )

Ta có : 5A = 5 + 5^2 +...+ 5^51

=> 5A - A = 4A = 5^51 - 1

=> A = \(\frac{5^{51}-1}{4}\)

sao ban lam được vậy

Sao tự dưng có 1 vậy bạn

\(C=\frac{1}{3}+\frac{1}{3^2}+\frac{1}{3^3}+...+\frac{1}{3^{99}}\)

\(\Leftrightarrow3C=1+\frac{1}{3}+\frac{1}{3^2}+...+\frac{1}{3^{98}}\)

\(\Leftrightarrow3C-C=1-\frac{1}{3^{99}}\)

\(\Leftrightarrow2C=1-\frac{1}{3^{99}}\)

\(\Leftrightarrow C=\frac{1-\frac{1}{3^{99}}}{2}=\frac{1}{2}-\frac{1}{2-3^{99}}\)

                        Vậy  \(C< \frac{1}{2}\)\(\left(DPCM\right)\)

tôi không biết

Hi, my name is Vy and I'm 11 years old. I am currently in Nghi Kim High School, 6th grade. My school is quite large, consisting of three main houses. There is a lawn, library. My school is very modern. The students here are very friendly, the teachers are very enthusias. I am very happy to be there.

Hi, my name is Vy and I'm 11 years old. I am currently in Nghi Kim High School, 6th grade. My school is quite large, consisting of three main houses. There is a lawn, library. My school is very modern. The students here are very friendly, the teachers are very enthusias. I am very happy to be there.

Hi, my name is Vy and I'm 11 years old. I am currently in Nghi Kim High School, 6th grade. My school is quite big, consisting of three main houses. There is a lawn, library. My school is very modern. The students here are very friendly, the teachers are very enthusias. I am very happy to be there.

Chúc bn học tốt

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 !

KO

      ĐĂNG

                  LINH

                                  TINH

em thấy chán vì phải đi học FUCK

?>';jm ỳbvbjk

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