a)

720 : (x - 17) = 12

x – 17 = 60

x = 60 + 17

x = 77

b)

(x - 28) : 12 = 8

x – 28 = 8 . 12

x – 28 = 96

x = 124

c)

26 + 8x = 6x + 46

8x – 6x = 46 – 26

2x == 20

x = 10

d)                 

3600 : [(5x + 335) : x] = 50

(5x + 335) : x = 72

5x + 335 = 72x

67x = 335

x = 5

Bạn ra từng bài thôi!!!!

Nhìn thế thấy nả ít người làm lắm

a)720/x(-17)=12

720/x=-12/17

x=720:(-12/17)

x=-1020

b)x-28/12=8

x=8+28/12

x=31/3

c)26+8x=6x+46

8x-6x=46-26

2x=20

x=20/2

x=10

d)3600/[(5x+355)/x]=50

(5x+355)/x=3600/50

5x+355=72x

72x-5x=355

67x=355

x=355/67

x = 355 /67

   (139139 . 133 - 133133 . 139) : (2 + 4+ 6 + ... + 2002)

= (139 . 1001 . 133 - 133 . 1001 . 139) : (2 + 4 + 6 + ... + 2002)

= 0 : (2 + 4 + 6 + ... + 2002)

= 0

a)\(720:\left(x-17\right)=12\)

    \(x-17=60\)

     \(x=17+60\)

      \(\Rightarrow x=77\)

b)\(\left(x-28\right):12=8\)

    \(x-28=96\)

      \(x=96+28\)

       \(\Rightarrow x=124\)

c)\(26+8x=6x+46\)

    \(8x-6x=46-26\)

      \(2x=20\)

     \(\Rightarrow x=10\)

d)\(3600:\left[\left(5x+335\right):x\right]=50\)

    \(\left(5x+335\right)x=72\)

     \(5x+335=72x\)

      \(335=67x\)

       \(\Rightarrow x=\frac{335}{67}=5\)

a)720: (x-17)=12

x-17=720:12

x-17=60

x=60+17

x=17

b)(x-28):12=8

x-28=8x12

x-28=96

x=96+28

x=124

c)26+8x=6x+46

26+8x-6x=46

2x=46-26

2x=20

x=20:2

x=10

d)3600:((5x+335):x)=50

(5x+335):x=3600:50

5x:x+335:x=720

5+335:x=720

335:x=720-5

335:x=715

x=335:715

x=67/143

a) \(720:\left(x-17\right)=12\)

\(\Leftrightarrow x-17=720:12\)

\(\Leftrightarrow x-17=60\)

\(\Leftrightarrow x=60+17\)

\(\Leftrightarrow x=77\)

b) \(\left(x-28\right):12=8\)

\(\Leftrightarrow x-28=8\cdot12\)

\(\Leftrightarrow x-28=96\)

\(\Leftrightarrow x=96+28\)

\(\Leftrightarrow x=124\)

c) \(26+8x=6x+46\)

\(\Leftrightarrow8x-6x=46-26\)

\(\Leftrightarrow2x=40\)

\(\Leftrightarrow x=20\)

d) \(3600:\left[\left(5x+335\right):x\right]=50\)

\(\Leftrightarrow\left(5x+335\right):x=3600:50\)

\(\Leftrightarrow\left(5x+335\right):x=72\)

\(\Leftrightarrow5x+335=72x\)

\(\Leftrightarrow67x=335\)

\(\Leftrightarrow x=5\)

ai nhanh mk k

mình nói bạn điều này bạn nên nhớ:

Khi gửi câu hỏi chỉ nên gửi 1 câu vì nhiều câu dù ng ta biết làm nhưng thấy nhiều quá ng ta ko muốn lm nữa.

Nhớ nhé!

Học tốt!

a)26+8x=6x+46

26-46=6x-8x

-20=-2x

=>x=10

b)3600:[(5x+335):x]=50

(5x+335):x=3600:50

(5x+335):x=72
=>5x+335=72x

=>335=67x

=>x=5

a, 720 : ( x - 17 ) = 12

=> x - 17 = 720 : 12 = 60

=> x = 60 + 17 = 77

\(a,\text{ }720\text{ : }\left(x-17\right)=12\)

                 \(\left(x-17\right)=720\text{ : }12\)

                  \(\left(x-17\right)=60\)

                                    \(x=60+17\)

                                    \(x=77\)

b, 26 + 8x = 6x + 46

=> 8x - 6x = 46 - 26

=> 2x = 20

=>x = 20: 2 =10

\(a,3\left(x-6\right)-11=22\)

\(\Rightarrow3\left(x-6\right)=22+11=33\)

\(\Rightarrow x-6=33:3=11\)

\(\Rightarrow x=11+6=17\)

\(b,4x-10-10=20\)

\(\Rightarrow4x=20+10+10=40\)

\(\Rightarrow x=40:4=10\)

\(c,5\left(x+2\right)+8=23\)

\(\Rightarrow5\left(x+2\right)=23-8=15\)

\(\Rightarrow x+2=15:5=3\)

\(\Rightarrow x=3-2=1\)

a) x - 17 = 720 : 12 = 60

   x = 60 + 17 = 77

vậy x = 17

b) x - 28 = 8 x 12 = 96

   x = 96 + 28 = 124

vậy x = 124

nhớ k nha