1000 + 1000 + 2000 + X = 12000
2000 + 2000 + X = 12000
4000 + X = 12000
X = 12000 - 4000
X = 8000
1000+1000+2000+X= 12000
40000+X=12000
X= 12000-4000
X=8000
4000 + X = 12 000
X = 12 000 - 4000
X = 8000
tk nhé
\(1000+1000+2000+x=12000\)
\(4000+x=12000\)
\(x=12000-4000\)
\(x=8000\)