1+1+1+1+1+1=90-X
6=90-X
90-6=X
84=X
=> X=84
Vậy X=84
1+1+1+1+1+1 = 90 - x
=> 6 = 90 - x
=> x= 90 - 6
=> x= 84
1 + 1 + 1 + 1 + 1 + 1 = 90 - x
6 = 90 - x
x = 90 - 6
x = 84
\(1+1+1+1+1+1=90-x\)
\(1.6=90-x\)
\(6=90-x\)
\(90-x=6\)
\(x=90-6\)
\(x=84\)
VẬY X=84
1 + 1 + 1 + 1 + 1 + 1 = 90 - x
6 = 90 - x
x = 90 - 6
x = 84
với