ta có: x=1.x
=> x+x= 1.x +1.x
=> x+x= x.(1+1)
=> x+x= x.2=2x
Học tốt :D
\(x+x=x\cdot1+x\cdot1=x\left(1+1\right)=2x\)
Giải:
\(x-96=\left(443-x\right)-15\)
\(x-96=443-x-15\)
\(x+x=443-15+96\)
\(2x=524\)
\(x=524:2\)
\(x=262\)
VD:
\(3+3=6\) mà \(2.3=6\)
\(\Rightarrow3+3=2.3\)
Vậy \(x+x=2x\)