tick cho mk nha!!!

3q=3^2-3^3+3^4-.....-3^2017+3^2018

3q+q=3+3^2018

4q=3+3^2018

q=\(\dfrac{3+3^{2018}}{4}\)

2s=2^2+2^3+2^4+2^5+....+2^201

lấy 2s-s ta có:(2^2+2^3+2^4+2^5+....+2^201)-(2+2^2+2^3+2^4+.....+2^200)

\(\Rightarrow\)s=2^201-2

chúc bạn học tốt

tick cho mk nha

C=(2+2^2+2^3+2^4+2^5)+(2^6+2^7+2^8+2^9+2^10)+......+(2^96+2^97+2^98+2^99+2^100)

C=2(1+2+2^2+2^3+2^4)+2^6(1+2+2^2+2^3+2^4)+......+2^96(1+2+2^2+2^3+2^4)

C=2.31+2^6.31+......+2^96.31

C=31(2+2^6+....+2^96) chia hết cho 31(đpcm)

chúc bạn học tốt

tick cho mk nha

C=(1-2)+(3-4)+(5-6)+(7-8)+9

C=(-1)+(-1)+(-1)+(-1)+9

C=5