\(a,128-3.\left(x+4\right)=23\\ \Rightarrow3.\left(x+4\right)=105\\ \Rightarrow x+4=35\\ \Rightarrow x=31\\ b,\left[\left(4x+28\right).3+55\right]:5=35\\ \Rightarrow\left(4x+28\right).3+55=175\\ \Rightarrow4x+28.3=120\\ \Rightarrow4x+28=60\\ \Rightarrow4x=32\\ \Rightarrow x=8.\)

c) \(\left(12x-4^3\right).8^3=4.8^4\)

\(12x-64=4.8^4:8^3\)

\(12x-64=32\)

\(12x=32+64\)

\(12x=96\)

\(x=\dfrac{96}{12}\)

\(x=8\)

d) \(720:\left[41-\left(2x-5\right)\right]:5=35\)

\(720:\left(41-2x+5\right):5=35\)

\(720:\left(46-2x\right)=35.5\)

\(720:\left(46-2x\right)=175\)

\(46-2x=720:175\)

\(46-2x=\dfrac{144}{35}\)

\(2x=46-\dfrac{144}{35}\)

\(2x=\dfrac{1466}{35}\)

\(x=\dfrac{1466}{35}:2\)

\(x=\dfrac{733}{35}\)

lm nốt hộ mik 2 ý cuối vs ạ

(2x - 4)³ = 8

(2x - 4)³ = 2³

2x - 4 = 2

2x = 2 + 4

2x = 6

x = 6 : 2

x = 3

\(\frac{720}{41-\left(2x-5\right)}=2^3\times5\)

\(\frac{720}{41-2x+5}=8\times5\)

\(46-2x=\frac{720}{40}\)

\(2x=46-18\)

2x = 28

x = 28 : 2

x = 14

giúp me được ko

a,

128-3x-12=23

3x=128-12-23

3x=93

x=93:3

= 31

b,

(12x+84+55):5=35

12x+84+55=35.5

12x+84+55=175

12x=175-55-84

12x=36

x=36:12

x=3

a, 128 – 3(x+4) = 23

b,  12 x - 4 3 . 8 3 = 4 . 8 4

c, [(4x+28).3+55]:5 = 35

d, 720:[41 – (2x – 5)] =  2 3 . 5

128-3.(x+4) =23                 

        3.(x+4) =128-23

        3.(x+4) = 105

            x+4 =105:3

            x+4 =35

               x = 35-4

               x=31

4.x + 5.x -x =128

a,  2 3 x + 5 2 x = 2 5 2 + 2 3 - 33

8x+25x = 33

33x = 33

x = 1

b,  260 : x + 4 = 5 2 3 + 5 - 3 3 2 + 2 2

260:(x+4) = 5.13–3.13

x+4 = 260:26

x+4 = 10

x = 6

c,  720 : [ 41 - 2 x - 5 ] = 2 3 . 5

41–(2x–5) = 720:40

2x–5 = 41–18

2x = 28

x = 14

d,  3 2 - 2 x - 12 + 35 = 5 2 + 279 : 3 2

7(x–12)+35 = 56

7(x–12) = 21

x–12 = 3

x = 15

a)120-3(x+4)=23

=>3(x+4)=120-23

=>3(x+4)=97

=>x+4=97:3

=>x+4=\(\frac{97}{3}\)

=>x=\(\frac{97}{3}\)-4

=>x=\(\frac{85}{3}\)

Vậy x=\(\frac{85}{3}\)

b)[(4x+28).3+55]:5=35

=>(4x+28).3+55=35.5

=>(4x+28).3+55=175

=>(4x+28).3=175-55

=>(4x+28).3=120

=>4x+28=120:3

=>4x+28=40

=>4x=40-28

=>4x=12

=>x=12:4

=>x=3

Vậyx= 3

c)\((12x-4^3).8^3=4.8^4\)

=>\(12x-64=4.8^4:8^3\)

=>12x-64=4.8

=>12x-64=32

=>12x=96

=>x=96:12

=>x=8

Vậy x=8

d)720:[41-(2x-5)]=2³.5

=>720:[41-2x-5)]=40

=>41-(2x-5)=720:40

=>41-(2x-5)=18

=>2x-5=41-18

=>2x-5=23

=>2x=23+5

=>2x=28

=>x=28:;2

=>x=14

Vậy x=14

a, 120 - 3 [ x+4]=23

     3 [x+4]= 120-23 = 97

      3x = 97-4

      3x= 93

        x= 93:3

        x=31

em bt làm mỗi bài này thui mà ko bt đúng ko

a) 120 - 3(x + 4) = 23

=> 3(x + 4) = 120 - 23 = 97

=> x + 4 = 97 : 3

=> x + 4 = 97/3

=> x = 97/3 - 4 = 85/3

b) [(4x + 28) . 3 + 55] : 5 = 35

=> [(4x + 28) . 3 + 55] = 175

=> (4x + 28).3 + 55 = 175

=> (4x + 28).3 = 120

=> 4x + 28 = 40

=> 4x = 12

=> x = 3

c) (12x - 4³).8³ = 4.8⁴

=> (12x - 4³) = \(\frac{4\cdot8^4}{8^3}=4\cdot8=32\)

=> 12x - 64 = 32

=> 12x = 96

=> x = 96 : 12 = 8

d) Tương tự

de qua

(1)\(2x+23=3^7\div3^4\)

\(2x+23=3^3\)

\(2.x=27-23=4\)

\(x=4\div2\)

\(x=2\)

~~~CÁC CÂU SAU BẠN TỰ LÀM NHÉ~~~

CŨNG KHÔNG KHÓ MẤY ĐÂU^_^ VỚI LẠI HƠI NHIỀU ĐÓ BẠN!!!

~~~HỌC TỐT NHA~~~