j: =>x-8=20
hay x=28
k: =>x+41=100
hay x=59
l: =>x-9=7
hay x=16
Lần sau đăng ít thôi ạ, ko có ai làm hết cái đống đó đâu !
`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 = 83 - 20
`73 -x = 23`
`x = 73 - 23`
`x = 50`
_______________________________
`e)`
` (x + 7) - 25 = 13`
`x + 7 = 13 + 25`
`x + 7 = 38`
`x = 38 - 7`
`x = 31`
_________________________________
`f)`
` 198 - ( x + 4) = 120`
`x + 4 = 198 - 120`
`x + 4 = 78`
`x =78 - 4`
`x = 74`
_____________________________________
` j)`
`140 : (x - 8) = 7`
`x - 8 = 140 : 7`
`x - 8 =20`
`x = 20 + 8`
`x = 28`
_________________________________
` k)`
`4.(x +41) = 400`
`x + 41 = 400 : 4`
`x + 41 = 100`
`x =100 - 41`
`x =59`
______________________________
`l)`
`11.(x-9) = 77`
`x -9 = 77 : 11`
`x -9 = 7`
`x =7 + 9`
`x = 16`
__________________________________
` m)`
`5.(x-9) = 350`
`x - 9 = 350 : 5`
`x - 9 = 70`
`x = 70 + 9`
`x =79`
___________________________________
` n)`
` 2x - 49 = 5.3^2`
`2x - 49 = 5. 9`
`2x - 49 = 49`
`2x = 49 +49`
`2x= 98`
`x = 98 : 2`
`x= 49`
________________________________
` o)`
` 200 - (2x + 6) = 4^3`
`200 - (2x + 6) = 64`
`2x + 6 = 200 - 64`
`2x + 6 = 136`
`2x = 136 - 6`
`2x = 130`
`x =130 : 2`
`x=65`
______________________________________
`#BaoL i n h`
`71 - (33 + x) = 26`
`33+ x = 71 - 26`
`33 + x = 45`
`x = 45 - 33`
`x= 12`
`(x + 73) - 26 = 76`
`x + 73 = 76 + 26`
`x + 73 = 102`
`x= 29`
` 45 - (x + 9) = 6`
`x + 9 = 45- 6`
`x +9 = 39`
`x =30`
` 89 - (73 - x) = 20`
`73 - x = 83 - 20
`73 -x = 23`
`x = 73 - 23`
`x = 50`
` (x + 7) - 25 = 13`
`x + 7 = 13 + 25`
`x + 7 = 38`
`x = 38 - 7`
`x = 31`
` 198 - ( x + 4) = 120`
`x + 4 = 198 - 120`
`x + 4 = 78`
`x =78 - 4`
`x = 74`
`140 : (x - 8) = 7`
`x - 8 = 140 : 7`
`x - 8 =20`
`x = 20 + 8`
`x = 28`
`4.(x +41) = 400`
`x + 41 = 400 : 4`
`x + 41 = 100`
`x =100 - 41`
`x =59`
`11.(x-9) = 77`
`x -9 = 77 : 11`
`x -9 = 7`
`x =7 + 9`
`x = 16`
`5.(x-9) = 350`
`x - 9 = 350 : 5`
`x - 9 = 70`
`x = 70 + 9`
`x =79`
` 2x - 49 = 5.3^2`
`2x - 49 = 5. 9`
`2x - 49 = 49`
`2x = 49 +49`
`2x= 98`
`x = 98 : 2`
`x= 49`
` 200 - (2x + 6) = 4^3`
`2x + 6 = 200 - 64`
`2x + 6 = 136`
`2x = 136 - 6`
`2x = 130`
`x=65`
