`a)-5(-x+7).3(-x-75)=-4(12-x)+48`
`5x -35 +3x+15 = -48 +4x +48`
`5x +3x -4x =-48 + 48 +35 -15 `
`4x = 20`
`x=20:4`
`x=5`
` Vậy ` `x=5`
`b)-2(15-3x)-4(-7x+8)=-5-9(-2x+1)`
`-30+6x+28x-32=-5+18x-9`
`34x-62=18x-14`
`34x-18x=62-14`
`16x=48`
`x=48:16`
`x=3`
` Vậy ` `x=3`
`c)5|x|=30`
`|x|=30:5`
`|x|=6`
`=>`\(\left[ \begin{array}{l}x=6\\x=-6\end{array} \right.\)
` Vậy `\(\left[ \begin{array}{l}x=6\\x=-6\end{array} \right.\)
`d)3|x|+2=3879`
`3|x| =3879-2`
`3|x| =3877`
`|x| =3877:3`
`|x| =3877/3`
`=>`\(\left[ \begin{array}{l}x=\frac{3877}{3}\\x=\frac{-3877}{3}\end{array} \right.\)
` Vậy ` \(\left[ \begin{array}{l}x=\frac{3877}{3}\\x=\frac{-3877}{3}\end{array} \right.\)
`e)2|x|+2-3=17`
`2|x| - 1 = 17`
`2|x| = 17 + 1`
`|x| = 18 : 2`
`|x| = 9`
`=>`\(\left[ \begin{array}{l}x=9\\x=-9\end{array} \right.\)
` Vậy ` \(\left[ \begin{array}{l}x=9\\x=-9\end{array} \right.\)
`f). 6(x+1) - 15 =21`
`6(x+1) = 21 + 15`
` 6(x+1) = 36`
`x+1 = 36 : 6`
` x = 6 - 1`
`x = 5`
` Vậy ` `x=5`
@๖ۣۜDũng ๖ۣۜSato
@Sức mạnh của chúng ta!!!
