Ta có: X x 456 + X x 544 + X = 12000
X x ( 456 + 544 + 1) = 12000
X x 1001 = 12000
X = 12000/1001
\(X\cdot456+X\cdot544+X=12000\)
\(X\cdot\left(456+544+1\right)=12000\)
\(X\cdot1001=12000\)
\(X=\frac{12000}{1001}\)
\(X=11\frac{989}{1001}\)
\(\cdot\)\(Là\)x (nhân) nha
x . 456 + x . 544 + x = 12000
x . 456 + x . 544 + x . 1 = 12000
x (456 + 544 + 1) = 12000
x . 1001 = 12000
x = 12000 : 1001
x = 11.98801198801
#Học tốt!!!
~NTTH~