a. x-36:18=12 b. (x-36):18=12 c. (5x-36):18=13 d. (x-890).(74-x)=0

`Bạn tham khảo nhé :`

`a, x-36:18=12`

`x-2=12`

`x=12+2`

`x=14`

`Vậy x=14`

`b, (x-36):18=12`

`x-36=12.18`

`x-36=216`

`x=216+36`

`x=252`

`Vậy x=252`

`c, (5x-36):18=13`

`5x-36=13.18`

`5x-36=234`

`5x=234+36`

`5x=270`

`x=270:5`

`x=54`

`Vậy x=54`

`d, (x-890).(74-x)=0`

`⇒x-890=0 hoặc 74-x=0`

`+, x-890=0`

`x=0+890`

`x=890`

`+, 74-x=0`

`x=74-0`

`x=74`

`Vậy x∈{890;74}`

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