a ) 28 + x = − 59 x = − 59 − 28 x = − 87

b ) x − 4 x 2 − 25 = 0 ⇔ x − 4 = 0 x 2 − 25 = 0 ⇔ x = 4 x 2 = 25 ⇔ x = 4 x = ± 5

x + 2 = 17 ⇒ x + 2 = 17 x + 2 = − 17 ⇒ x = 15 x = − 19

d ) − 19 + 4 ( 2 − x ) = 25 − x − 19 + 8 − 4 x = 25 − x 4 x − x = − 19 + 8 − 25 3 x = − 36 = > x = − 12  

Tương tự 3. HS tự làm.

\(-19+4\left(2-x\right)=25-x\)

\(-19+8-4x=25-x\)

\(x-4x=25+19-8\)

\(-3x=36\)

\(x=-12\)

-19+4.(2-x)=25-x

-19+8-4x=25-x

-8-4x=25-x

-4x+x=25+8

-3x=33

   x=33:(-3)

   x=-11

Vậy x=-11

\(-19+4\left(2-x\right)=25-x\)

\(-19+8-4x=25-x\)

\(-8-4x=25-x\)

Bạn tự làm tiếp nhé~~
học tốt~

a ) x - ( - 18 ) = -24

x + 18 = -24

x = -24 - 18

x = -6

b ) -x - 17 + 8 = 33 - 19

-x - 17 + 8 = 14

-x - 17 = 14 - 8

-x - 17 = 6

-x =  -( 6 + 17 )

-x = - 23

c ) 15 - ( -4 + 7 ) = x - 14

15 + 4 + 7 = x - 14

27 = x - 14 

x - 14 = 27

x = 27 + 14

x = 41

d ) 9 - 25 = ( 7 - x ) - ( 25 + 7 ) 

( 7 - x ) - 32 = -16

7 - x = -16 + 32 

-7 - x = -16

x = -7 - ( - 16)

x = -7 + 16

x = 9

Đề sai chắc luôn đoạn kìa là `3xx5^{x-2}` mới đúng

`3xx5^{x-2}+4xx5^{x-3}=19xx5^10`

`=>3xx5^{x-3+1}+4xx5^{x-3}=19xx5^10`

`=>3xx5xx5^{x-3}+4xx5^{x-3}=19xx5^10`

`=>15xx5^{x-3}+4xx5^{x-3}=19xx5^10`

`=>19xx5^{x-3}=19xx5^10`

`=>5^{x-3}=5^10`

`=>x-3=10`

`=>x=13`

Vậy `x=13`

cíu bé

help

Hãy tham gia nhóm Học sinh Hoc24OLM 

a)x=4-12=-8

b)x=19-0=19

c)x=-12+4:2=-4

d)x=6+(-2):2=2

\(4-2\left(x+1\right)=x\)

\(4-2x+2=x\)

\(-2x-x=-4-2\)

\(-3x=-6\)

\(x=2\)

Vậy pt có nghiệm là 2 

\(4-2\left(x+1\right)=-x\)

\(\Leftrightarrow4-2x-2=-x\)

\(\Leftrightarrow2-2x+x=0\)

\(\Leftrightarrow2-x=0\)

\(\Leftrightarrow x=2\)

tham khảo ở đây nhé!! https://olm.vn/hoi-dap/detail/69356782501.html

hok tốt!!!

\(\dfrac{-19}{23}< \dfrac{7}{x}< \dfrac{-19}{25}\\ \Leftrightarrow7:\dfrac{-19}{23}< x< 7:\dfrac{-19}{25}\\ \Leftrightarrow\dfrac{-161}{19}< x< \dfrac{-175}{19}\\ \Leftrightarrow-161< 19x< -175\\ \Leftrightarrow x=-9\)