3: UCLN(24;36;12)=12

a) X  x  56  =  308 x 2

X x 56 = 616

x = 616 : 56

x = 11

b) X   :   24 =  2507-1205

x : 24 = 1302

x = 1302 x 24

x = 31248

a)  X  x  56  =  308 x 2

X x 56 = 616

x = 616 : 56

x = 11

b) x : 24 = 2507 -1205

 X   :   24 =  1302

x = 1302 x 24

x = 31248

a, x : 25 = 1205 : 5

x : 25 = 241

x = 241 x 25

x = 6025

b, 2018 – x = 425 +725

2018 – x = 1150

x = 2018 – 1150

x = 868

\(x=5k+3\left(k\in N\right)\)

=> cái vế  trong ngoặc là 0.

rồi bạn làm tiếp nha

\(\dfrac{-12}{25}.\left(\dfrac{3}{4}-x+\dfrac{6}{-11}-\dfrac{5}{6}\right)=0\)

\(\dfrac{3}{4}-x+\dfrac{-6}{11}-\dfrac{5}{6}=0\)

\(\dfrac{3}{4}-x+\dfrac{-91}{66}=0\)

\(\dfrac{3}{4}-x=0-\left(\dfrac{-91}{66}\right)\)

\(\dfrac{3}{4}-x=\dfrac{91}{66}\)

\(x=\dfrac{-83}{132}\)

a: Ta có: \(-\dfrac{12}{25}\cdot\left(\dfrac{3}{4}-x+\dfrac{6}{-11}-\dfrac{5}{6}\right)=0\)

\(\Leftrightarrow x+\dfrac{83}{132}=0\)

hay \(x=-\dfrac{83}{132}\)

90 : xx = 6    

=> xx = 90 : 6 = 15

70500

2376

90790

x : 30 = 2350

x         = 2350 x 30

x         = 70500

21384 : x = 9

              x = 21384 : 9

              x = 2376

92080 - x = 1205 + 85

92080 - x = 1290

               x = 92080 - 1290

               x = 90790

a,x:30=2350

  x=2350x30

  x=70500 

b,21384:x=9

  x=21384:9

x=5346

c,92080-x=1205+85

  92080-x=1290

  x=92080-1290

  x=90790

   C.3600

C

C

x thuoc cac so co tan cung la so 2 vi du (2;12;22;32;...)