a,123-5(x+4)=28

(=)5(x+4)=85

(=) x+4=17

(=) x=13

b,10+2x=2.\(\left(3^2-1\right)\)

(=) 10+2x=16

(=) 2x = 6 

(=)x=3

A, 123-5.(x+4)=38

            5.(x+4)=123-38

           5.(x+4) =85

               (x+4)=85:5

               (x+4)=17

                x      =17-4

                x      =13

B, 10+2x=2(\(3^2-1\))

     10+2x=2.8

     10+2x=16

           2x=16-10

           2x=6

             x=6:2

            x  =3

CÁC BN GIÚP MK NHA MK ĐANG CẦN RẤT GẤP LUN HELP ME PLEASE

AI NHANH MK K CHO

tao ngu lắm

\(\frac{3}{4}< \frac{x}{24}< \frac{8}{9}\)

\(\frac{54}{72}< \frac{3x}{72}< \frac{64}{72}\)

Suy ra \(54< 3x< 64\)

\(\rightarrow x=19;20;21\)

Vậy   \(x\in\left\{19;20;21\right\}\)

x\(\in\){19,20,21}

\(\left|2x-1\right|+\left(2y+1\right)^2=0\)

<=> \(\hept{\begin{cases}2x-1=0\\\left(2y+1\right)^2=0\end{cases}}\)

<=>\(\hept{\begin{cases}x=\frac{1}{2}\\y=\frac{-1}{2}\end{cases}}\)

\(\left(3x+2\right)^6+\left|y+1\right|\) \(=0\)

<=> \(\hept{\begin{cases}\left(3x+2\right)^6=0\\\left|y+1\right|=0\end{cases}}\)

<=> \(\hept{\begin{cases}x=\frac{-2}{3}\\y=-1\end{cases}}\)

học tốt

mk sửa nè

chỗ gấn cuối có she is nha mk viết thiếu i đó sorry hi hi

a) 175 - (4 - x) : 3 = 95

=> (4 - x) : 3 = 175 - 95

=> (4 - x) : 3 = 80

=> 4 - x = 80 . 3

=> 4 - x = 240

=> x = 4 - 240

=> x = -236

Vậy x = -236

b) (3x - 5) - 14 = 71

=> 3x - 5 = 71 + 14

=> 3x - 5 = 85

=> 3x = 85 + 5

=> 3x = 90

=> x = 90 : 3

=> x = 30

Vậy x = 30

\(\left(2^{17}+17^2\right)\left(9^{15}-15^9\right)\left(4^2-2^4\right)\)

\(=\left(2^{17}+17^2\right)\left(9^{15}-15^9\right)\left(16-16\right)\)

\(=\left(2^{17}+17^2\right)\left(9^{15}-15^9\right).0\)

\(=0\)

p/s: chúc bạn học tốt