Question

giúp mk gấp 

Answer 1

giúp mk với , 1 câu thôi 

trước chín giờ là mk phải nộp r

 

Answer 2

\(a,M=\left(5+5^2\right)+\left(5^3+5^4\right)+...+\left(5^{99}+5^{100}\right)\\ M=5\left(1+5\right)+5^3\left(1+5\right)+...+5^{99}\left(1+5\right)\\ M=6\left(5+5^3+...+5^{99}\right)⋮6\\ b,N=\left(1+4+4^2\right)+\left(4^3+4^4+4^5\right)+...+\left(4^{60}+4^{61}+4^{62}\right)\\ N=\left(1+4+4^2\right)+4^3\left(1+4+4^2\right)+...+4^{60}\left(1+4+4^2\right)\\ N=\left(1+4+4^2\right)\left(1+4^3+...+4^{60}\right)\\ N=21\left(1+4^3+...+4^{60}\right)⋮21\)