Question

tìm số tự nhiên x,biết :

a) ( x - 35 ) - 120 = 0

b) 124 + ( 118 - x ) = 217

c) 156 - ( x + 61) = 82

giúp mk với 

Answer 1

a) (x - 35) - 120 = 0

x - 35 = 120

x = 120 + 35

x = 155

b) 124 + ( 118 - x ) = 217

118 - x = 124 - 117

118 - x = 7

x = 118 - 7

x = 111

c) 156 - ( x + 61 ) = 82

x + 61 = 156 - 82

x + 61 = 74

x = 74 - 61

x = 13

Chúc bạn học tốt ^^

Answer 2

a) ( x - 35 ) - 120 = 0

=> x - 35             = 0 + 120

=> x - 35             = 120

=> x                    = 120 + 35

=> x                    = 155

b) 124 + ( 118 - x ) = 217

=> 118 - x  = 124 - 217

=> 118 - x  = -93

=> -x          = -93 - 118

=> -x          = -211

=> x           = 211

c) 156 - ( x + 61) = 82

x + 61 = 156 - 82

x + 61 = 74

=> x = 74 - 61

=> x = 13

Answer 3

a) ( x - 35 ) - 120 = 0

( x - 35 ) = 0 + 120

x - 35 = 120

x = 120 + 35

x = 155

b) 124 + ( 118 - x ) = 217

118 - x = 217 - 124

118 - x = 93

x = 118 - 93

x = 25

c) 156 - ( x + 61 ) = 82

x + 61 = 82 + 156

x + 61 = 238

x = 238 - 61

x = 177

Answer 4

a/

( x - 35 ) - 120 = 0

  x - 35             = 0 + 120 = 120

x                      = 120 + 35 = 155

b/

124 + ( 118 - x ) = 217

118 - x                = 217 - 124 = 93

x                          = 118 - 93 = 25

c/

156 - ( x + 61 ) = 82

x + 61               = 156 - 82 = 74

x                        = 74 - 61 = 13

Answer 5

a) (x-35)-120=0

x-35=120

x=120+35

x=155

 vậy x= 155

b) 124+(118-x) =217

118-x=217-124

118-x=93

x=118-93

x=25

vậy x=25

c) 156-(x+61) =82

x+61=156-82

x+61=74

x=74-61

x=13

vậy x=13