Question

Answer 1

Bài `2` `:`

`a) x + 3 2/5 = 5 1/2`

`=> x + 17/5 = 11/2`

`=> x = 11/2 - 17/5`

`=> x = 55/10 - 34/10`

`=> x = 21/10`

`b) x : 2 1/4 = 3 2/5`

`=> x : 9/4 = 17/5`

`=> x = 17/5 xx 9/4`

`=> x = 153/20`

Answer 2

Bài 3:

a: =>7,5<x<10,5

=>\(x\in\left\{8;9;10\right\}\)

b: =>105/12>x>50/12

hay \(x\in\left\{5;6;7;8\right\}\)