\(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)+...+\left(x+222\right)=27195\)
\(\Leftrightarrow\left(x+x+x+...+x\right)+\left(1+2+3+...+222\right)=27195\)
\(\Leftrightarrow\left(x+x+x+...+x\right)+\frac{\left(222+1\right)\left[\left(222-1\right):1+1\right]}{2}=27195\)
\(\Leftrightarrow222x+24753=27195\)
\(\Leftrightarrow222x=2442\Leftrightarrow x=11\)
\(222x+\left(1+2+3+4+...+222\right)=27195\)
1 + 2 + 3 + 4 + ... + 222
Số số hạng : ( 222 - 1 ) : 1 + 1 = 222
Tổng : ( 222 + 1 ) x 222 : 2 = 24753
\(222x+24753=27195\)
\(222x=27195-24753\)
\(222x=2442\)
\(x=11\)