Question

Câu 1: Tìm x:

a)   x + 123 = 249

b)   459 – x = 211

c)  x +4/5=23/4 -7/6

121 : x = 136 – 125

Answer 1

a)   `x + 123 = 249`

` x = 249 - 123`

` x = 126`

 

b)   459 – x = 211

` x = 459 - 211`

` x = 248`

 

c)  `x +4/5=23/4 -7/6`

` x + 4/5 = 55/12`

`x = 55/12 - 4/5`

` x= 227/60`

 

`121 : x = 136 – 125`

` 121 : x = 11`

` x = 121 : 11`

` x = 11`

Answer 2

`a)x+123=249`

`x=249-123`

`x=126`

`b)459-x=211`

`x=459-211`

`x=248`

`c)x +4/5=23/4-7/6`

`x+4/5=(138-28)/24`

`x+4/5=110/24`

`x+4/5=55/12`

`x=55/12-4/5`

`x=227/60`

`121 : x = 136 – 125`

`121:x=111`

`x=121:11`

`x=11`

Answer 3

\(a,x+123=249\\ x=249-123\\ x=126\\ b,459-x=211\\ x=459-211\\ x=248\\ c,x+\dfrac{4}{5}=\dfrac{23}{4}-\dfrac{7}{6}\\ x+\dfrac{4}{5}=\dfrac{87}{20}\\ x=\dfrac{87}{20}-\dfrac{4}{5}=\dfrac{71}{20}\\ d,121:x=136-125\\ 121:x=11\\ x=121:11\\ x=11\)

Answer 4

a)   x + 123 = 249

x=249-123

x=126

b)   459 – x = 211

x=459-211

x=248

c)  x +4/5=23/4 -7/6

x+4/5=69/12-14/12

x+4/5=55/12

x=55/12-4/5

x=275/60 - 48/60

x=227/60

 

121 : x = 136 – 125

121 :x =  11

x=121:11

x=11

 

Answer 5

a)x + 123 = 249
   x    =   249 - 123
    x   =       126
b) 459 - x = 211
              x =  459 - 211
              x =    248
c)  x + 4/5 = 23/4 - 7/6
     x + 4/5 =       55/12
     x          =    55/12 - 4/5
      x          =         227/60
d) 121 : x = 136 - 125
     121 : x =      11
               x = 121 : 11
               x =        11

Answer 6

a) x + 123 = 249

x           = 249 - 123

x           =126

b) 459 - x = 211

x               = 459-123

x               = 336

121: x = 136 -125

121:x =11

x=121:11

x=11