\(a,x-35=120\\ x=120+35\\ x=155\\ b,x+74=200+318\\ x+64=518\\ x=454\\ c,118-x=217-124\\ 118-x=93\\ x=25\\ d,12x-91=101\\ 12x=192\\ x=16\\ e,x+61=156-82\\ x+61=74\\ x=13\\ f,x:23+45=133\\ x:23=88\\ x=2024\)
a: =>x-35=120
=>x=155
b: =>x+74=518
=>x=444
c: =>118-x=217-124=93
=>x=25
d: =>12x-91=101
=>12x=192
=>x=16
a, x - 35 = 120
x = 120 + 35
x = 155
b, x + 74 = 518
x = 518 - 74
x= 444
c, 118 - x = 93
x = 118 - 93
x = 25
d, 12x - 91 = 101
12x = 192
x = 192 : 12
x = 16
e, x + 61 = 74
x = 74 - 61
x = 13
f, x : 23 + 45 = 133
x : 23 = 88
x = 88 x 23
x = 2024
`(x-35)-120=0`
`x-35=0+120`
`x-35=120`
`x=120+35`
`x=155`
_________________________
`(x+74)-318=200`
`x+74=200+318`
`x+74=518`
`x=518-74`
`x=444`
___________________________
`124+(118-x)=217`
`118-x=217-124`
`118-x=93`
`x=118-93`
`x=25`
__________________________
`3636:(12x-91)=36`
`12x-91=3636:36`
`12x-91=101`
`12x=101+91`
`12x=192`
`x=192:12`
`x=16`
______________________________
`156-(x+61)=82`
`x+61=156-82`
`x+61=74`
`x=74-61`
`x=13`
_________________________
`(x:23+45).67=8911`
`x:23+45=8911:67`
`x:23+45=133`
`x:23=133-45`
`x:23=88`
`x=88xx23`
`x=2024`
Tìm số tự nhiên x, biết:
a/ (x – 35) – 120 = 0
(x – 35) = 0 + 120
(x – 35) = 120
x = 120 + 35
x = 155
b/ (x + 74) – 318 = 200
(x + 74) = 200 + 318
(x + 74) = 518
x = 518 – 74
x = 444
c/ 124 + (118 – x) = 217
(118 – x) = 217 – 124
(118 – x) = 93
x = 118 – 93
x = 25
d/ 3636 : (12x – 91) = 36
(12x – 91) = 3636 : 36
(12x – 91) = 101
12x = 101 + 91
12x = 192
x = 192 : 12
x = 16
e/ 156 – (x + 61) = 82
(x + 61) = 156 – 82
(x + 61) = 74
x = 74 – 61
x = 13
f/ (x : 23 + 45) . 67 = 8911
(x : 23 + 45) = 8911 : 67
(x : 23 + 45) = 133
x : 23 = 133 - 45
x : 23 = 88
x = 88 . 23
x = 2024.
