Question

GIÚP MIK BÀI 2 

 

Answer 1

Bài 2: 

M=(1-2-3+4)+(5-6-7+8)+...+(2017-2018-2019+2020)+2021=2021

Answer 2

Bài 1:
a) \(A=\left\{-3;-2;-1;0;1;2;3;4;5\right\}\)
b)
\(\left(-3\right)+\left(-2\right)+\left(-1\right)+0+1+2+3+4+5=\left(-6\right)+15=9\)