ta có
6,8x + 3,1x +x =45,3
=> X x( 6,8+3,1+1)=45,3
=>X x 10.9 = 45,3
=> X= 45,3: 10.9
=> X= 453/109
.
\(6,8\times x+3,1\times x+x=45,3\)
\(x\times\left(6,8+3,1+1\right)=45,3\)
\(x\times10=45,3\)
\(x=45,3\div10\)
\(x=4,53\)
_Kik nha!! ^ ^
6,8 x X + 3,1 x X + X = 45,3
X x (6,8 + 3,1 + 0,1) = 45,3
X x 10 = 45,3
X = 45,3 : 10
X = 4,53