1/tìm X
2 . |x + 1| -3 =5
2/a/ -1/8 + -5/3
b/ -6/35 . -49/54
c/ -4/5 : 3/4
1/tìm X 2 . |x + 1| -3 =5 2/a/ -1/8 + -5/3 b/ -6/35 . -49/54 c/ -4/5 : 3/4
By Lyla
By Lyla
1/tìm X
2 . |x + 1| -3 =5
2/a/ -1/8 + -5/3
b/ -6/35 . -49/54
c/ -4/5 : 3/4
Đáp án:
Giải thích các bước giải:
`1:`
`|x + 1| -3 =5`
`->|x+1|=5+3`
`->|x+1|=8`
`->` \(\left[ \begin{array}{l}x+1=8\\x+1=-8\end{array} \right.\)
`->` \(\left[ \begin{array}{l}x=7\\x=-9\end{array} \right.\)
Vậy `x∈{-9;7}`
`2a)` `-1/8+(-5/3)=(-3)/24+(-40)/24=(-3+(-40))/24=-43/24`
`b)` `(-6)/35 . (-49)/54=7/45`
`c)` `(-4)/5 : 3/4=(-4)/5 . 4/3=(-16)/15`
1, |x + 1| -3 =5
|x + 1| =5-3
|x + 1| =2
TH1:
x-1=2
=> x=3
TH2:
x-1= -2
=> x= -1
2,
a)-1/8 + -5/3=-43/24
b) -6/35 . -49/54=7/45
c) -4/5 : 3/4 =-16/15