x = 7, 21 ; 7,22 .... rất nhiều giá trị
x=7,21,..........................................................................................................................................................................................................................................................
\(7,2< x< 7,3\)
\(x=7,3-7,2\)
\(x=0,1\)
vậy x = 0,1
co rat nhieu ban oi
khong dem duoc
tk nhe!!
ai tk minh minh tk lai
