Toán Tìm x: a) 1/2 . x – 2/3 = -5/9 b) |x-1|=5 06/07/2021 By Hadley Tìm x: a) 1/2 . x – 2/3 = -5/9 b) |x-1|=5
`a)1/2x-2/3=(-5/9)``=>1/2x=(-5/9)+2/3``=>1/2x=1/9``=>x=1/9:1/2=2/9``b)|x-1|=5``TH_1:|x-1|=5``=>x-1=5``=>x=5+1=6``TH_2:|x-1|=5``=>x-1=(-5)``=>x=(-5)+1``=>x=(-4)`Vậy `x=(6;-4)` Trả lời
Đáp án: `a)1/2*x-2/3=-5/9` `\qquad 1/2*x=-5/9+2/3` `\qquad 1/2*x=-5/9+6/9` `\qquad 1/2*x=1/9` `\qquad x=2/9` Vậy `x=2/9` `b)|x-1|=5` `=>` \(\left[ \begin{array}{l}x-1=5\\x-1=-5\end{array} \right.\) `=>` \(\left[ \begin{array}{l}x=6\\x=-4\end{array} \right.\) Vậy `x=6` hoặc `x=-4`. Trả lời
`a)1/2x-2/3=(-5/9)`
`=>1/2x=(-5/9)+2/3`
`=>1/2x=1/9`
`=>x=1/9:1/2=2/9`
`b)|x-1|=5`
`TH_1:|x-1|=5`
`=>x-1=5`
`=>x=5+1=6`
`TH_2:|x-1|=5`
`=>x-1=(-5)`
`=>x=(-5)+1`
`=>x=(-4)`
Vậy `x=(6;-4)`
Đáp án:
`a)1/2*x-2/3=-5/9`
`\qquad 1/2*x=-5/9+2/3`
`\qquad 1/2*x=-5/9+6/9`
`\qquad 1/2*x=1/9`
`\qquad x=2/9`
Vậy `x=2/9`
`b)|x-1|=5`
`=>` \(\left[ \begin{array}{l}x-1=5\\x-1=-5\end{array} \right.\)
`=>` \(\left[ \begin{array}{l}x=6\\x=-4\end{array} \right.\)
Vậy `x=6` hoặc `x=-4`.