Question

1:tinh tong cua tat ca cac so nguyen x thoa man

|x|<6

 

 

Answer 1

\(\left|x\right|< 6\Leftrightarrow\left|x\right|=1;2;3;4;5\)

Nếu \(\left|x\right|=1\orbr{\begin{cases}x=-1\\x=1\end{cases}}\)

Nếu \(\left|x\right|=2\orbr{\begin{cases}x=-2\\x=2\end{cases}}\)

Nếu \(\left|x\right|=3\orbr{\begin{cases}x=-3\\x=3\end{cases}}\)

Nếu \(\left|x\right|=4\orbr{\begin{cases}x=-4\\x=4\end{cases}}\)

Nếu \(\left|x\right|=5\orbr{\begin{cases}x=-5\\x=5\end{cases}}\)

Answer 2

x=1;2;3;4;5;-1;-2;-3;-4;-5

Answer 3

 ta co ;x =-1, -2 , -3 , -4 ,-5 ,-6, 0, 1 ,2, 3 ,4, 5 ,

tong la ; 0 +-1 + -2 +) +3 +-4+-5+-6+1+2+3+5

=[(-1) +1] + [(-2)+2] + [( -3) +3] + [(-4) +4] + [(-5) +5] = 0