Toán 14-|x-3|=8 (72-x)+6^15:6^14=21 5x+12=47 2(x-1)=7+(-3) 07/12/2021 By Kinsley 14-|x-3|=8 (72-x)+6^15:6^14=21 5x+12=47 2(x-1)=7+(-3)
`14-|x-3|=8` `to|x-3|=14-8` `to|x-3|=6` \(\to\left[ \begin{array}{l}x-3=6\\x-3=-6\end{array} \right.\) \(\to\left[ \begin{array}{l}x=6+3\\x=-6+3\end{array} \right.\) \(\to\left[ \begin{array}{l}x=9\\x=-3\end{array} \right.\) `(72-x)+6^15:6^14=21` `to(72-x)+6=21` `to72-x=21-6` `to72-x=15` `tox=72-15` `tox=57` `5x+12=47` `to5x=47-12` `to5x=35` `tox=35:5` `tox=7` `2(x-1)=7+(-3)` `to2(x-1)=4` `tox-1=4:2` `tox-1=2` `tox=2+1` `tox=3` Trả lời
Giải thích các bước giải: 14 – |x-3|= 8 |x-3| = 14 – 8 |x-3| = 6 TH1 : x – 3 = 6 x = 6 + 3 x = 9 TH2 : x – 3 = -6 x = ( -6 ) + 3 x = -3 Vậy x ∈ { 9, -3 } (72-x)+6^15:6^14=21 (72-x)+ 6 =21 (72-x) =21 – 6 72-x = 15 x = 72 – 15 x = 57 Vậy x = 57 5x+12=47 5x =47 – 12 5x =35 x =35 : 5 x =7 Vậy x = 7 2(x-1)=7+(-3) 2(x-1)=4 (x-1)=4:2 x-1 =2 x =2+1 x =3 Vậy x = 3 Trả lời
`14-|x-3|=8`
`to|x-3|=14-8`
`to|x-3|=6`
\(\to\left[ \begin{array}{l}x-3=6\\x-3=-6\end{array} \right.\)
\(\to\left[ \begin{array}{l}x=6+3\\x=-6+3\end{array} \right.\)
\(\to\left[ \begin{array}{l}x=9\\x=-3\end{array} \right.\)
`(72-x)+6^15:6^14=21`
`to(72-x)+6=21`
`to72-x=21-6`
`to72-x=15`
`tox=72-15`
`tox=57`
`5x+12=47`
`to5x=47-12`
`to5x=35`
`tox=35:5`
`tox=7`
`2(x-1)=7+(-3)`
`to2(x-1)=4`
`tox-1=4:2`
`tox-1=2`
`tox=2+1`
`tox=3`
Giải thích các bước giải:
14 – |x-3|= 8
|x-3| = 14 – 8
|x-3| = 6
TH1 : x – 3 = 6
x = 6 + 3
x = 9
TH2 : x – 3 = -6
x = ( -6 ) + 3
x = -3
Vậy x ∈ { 9, -3 }
(72-x)+6^15:6^14=21
(72-x)+ 6 =21
(72-x) =21 – 6
72-x = 15
x = 72 – 15
x = 57
Vậy x = 57
5x+12=47
5x =47 – 12
5x =35
x =35 : 5
x =7
Vậy x = 7
2(x-1)=7+(-3)
2(x-1)=4
(x-1)=4:2
x-1 =2
x =2+1
x =3
Vậy x = 3