`7^2 × 7 ×(13-x) = 14`
`=>7^3 ×(13-x) = 14`
`=> 343×(13-x) = 14`
`=> 13-x=14 : 343`
`=> 13-x=2/49`
`=>x=13-2/49`
`=>x= 635/49`
`@ Thien Vy`
72−7(13−x)=14
7\left(13-x\right)=49-14=357(13−x)=49−14=35
13-x=35:7=513−x=35:7=5
=> x=13-5=8x=13−5=8
xin 5* ạ
`7^2 .7.(13-x) =14`
`7^2 .(13-x) =2`
`13-x = 2/(7^2) = 2/49`
`x = 13-2/49 = 635/49`
\(7^2.7(13-x)=14\)
\(49.7(13-x)=14\)
\(343(13-x)=14\)
\(13-x=343:14\)
\(13-x=24,5\)
\(x=24,5-3\)
\(x=21,5\)
\(7^2\times7\times\left(13-x\right)=14\)
\(\Leftrightarrow343\times\left(13-x\right)=14\)
\(\Leftrightarrow13-x=\dfrac{2}{49}\)
\(\Leftrightarrow x=13-\dfrac{2}{49}\)
\(\Leftrightarrow x=\dfrac{637}{49}-\dfrac{2}{49}\)
\(\Leftrightarrow x=\dfrac{635}{49}\)
7 2 −7(13−x)=14
7(13-x)=49-14=357(13−x)=49−14=35
13-x=35:7=513−x=35:7=5
=> x=13-5=8x=13−5=8
xin 5* ạ
