~ Bạn tham khảo ~
`a) (2/3-x) xx 1/3 = 2/5`
`(2/3-x) = 2/5 : 1/3`
`(2/3-x) = 2/5 xx 3`
`2/3-x = 6/5`
`x = 2/3 - 6/5`
`x= 10/15 - 18/15`
`x=-8/15`
Vậy ` x = -8/15`
`b) x : 144 - 23 = 121`
`x : 144 = 121 + 23`
`x : 144 = 144`
`x = 144 xx 144`
`x = 20736`
Vậy ` x = 20736`
`c) (2xxx+1) xx 2,86 = 35,464`
`(2xxx+1) = 35,464 : 2,86`
`(2xxx+1) = 12,4`
`2xxx = 12,4 -1`
`2xxx = 11,4`
`x = 11,4 : 2`
`x = 5,7`
Vậy ` x = 5,7`
$#Vịt vàng$
