Trả lời:
\(-129-\left(35-x\right)=55\)
\(\Leftrightarrow35-x=-129-55\)
\(\Leftrightarrow35-x=-184\)
\(\Leftrightarrow x=35-\left(-184\right)\)
\(\Leftrightarrow x=35+184\)
\(\Leftrightarrow x=219\)
Vậy \(x=219\)
-129 - ( 35 - x ) = 55
35 - x = -129 - 55
35 - x = -134
x = 169
vậy x = 169
\(-129-\left(35-x\right)=55\)
\(-129-35+x=55\)
\(-164+x=55\)
\(x=55+164=219\)
M={22+24+26+.....+96+98}
