Question

Tìm x:

a) 71 – (33 + x) = 26

b)   (x + 73) – 26 = 76
c)   45 – (x + 9) = 6
d)   89 – (73 – x) = 20

Answer 1

`a) 71 – (33 + x) = 26`

`=>33+x = 71-26`

`=>33+x=45`

`=>x=45-33`

`=>x=12`

`b)   (x + 73) – 26 = 76`

`=>x+73=76+26`

`=>x+73=102`

`=>x=102-73`

`=>x=29`
`c)   45 – (x + 9) = 6`

`=>x+9=45-6`

`=>x+9=39`

`=>x=39-9`

`=>x=30`
`d)   89 – (73 – x) = 20`

`=>73-x=89-20`

`=>73-x=69`

`=>x=73-69`

`=>x=4`

Answer 2

Answer 3

a) 71 - (33 + x) = 26

⇔33 + x = 71 - 26

⇔33 + x = 45

⇔x = 45 - 33

⇔x = 12

b) (x + 73) - 26 = 76

⇔x + 73 = 76 + 26

⇔x + 73 = 102

⇔x = 102 - 73

⇔x = 29

c) 45 - (x + 9) = 6

⇔x + 9 = 45 - 6

⇔x + 9 = 39

⇔x = 39 - 9 

⇔x = 30

d) 89 - (73 - x) = 20

⇔73 - x = 89 - 20

⇔73 - x = 69

⇔x = 73 - 69

⇔x = 4

Answer 4

a) 71 – (33 + x) = 26

33+x = 71-26

33+x = 45

x = 45-33

x = 12

b)

(x + 73) – 26 = 76

x+73 = 76+26

x+73 = 102

x = 102 - 73

= 29

c)

45 – (x + 9) = 6

x+9 = 45-6

x+9 = 39

x = 39-9

x = 30

d)

 89 – (73 – x) = 20

73-x = 89-20

73-x = 69

x = 73-69

x = 4

 

Answer 5

a )                                         

\(71 - ( 33 + x ) = 26 \)

\(33 + x = 71 -26 \)

\(33 + x = 45 \)

\(x = 45 - 33 \)

\(x = 12 \)

b )

\(( x + 73 ) - 26 = 76 \)

\(x + 73 = 76 + 26 \)

\(x + 73 = 102\)

\(x = 102 - 73 \)

\(x= 29 \)

c)

\(x + 9 = 45 - 6\)

\(x + 9 = 39 \)

\(x = 39 - 9 \)

\(x = 30 \)

d)

\(89 - ( 73 - x ) = 20 \)

\(73 - x = 89 -20 \)

\(73 - x = 69 \)

\(x = 73 - 69 \)

\(x = 4 \)

Answer 6

a  71 - (33+x) = 26
             33+x  = 71 - 26
             33+x  = 45
                   x  = 45 - 33
                   x  = 12

Answer 7

b) (x + 73) - 26 = 76
     x + 73          = 76 + 26
     x + 73          =   102
     x                  =   102 - 73
     x                  =    76