giúp mình với càng nhanh càng tốt cảm ơn

\begin{array}{c}\color{#003366}{-Re}\color{#005A9C}{dD}\color{#007ACC}{e}\color{#00AEEF}{vi}\color{#00CFFF}{ls}\color{#A4D3EE}{-}\color{#D3D3D3}{}\color{#E0E0E0}{}\end{array}

`a)`

` Ư(25)={1,5,25}`

` Ư(35)={1,5,7,35}`

`UC(25,35)={1,5}`

`b)`

` Ư(10)={1,2,5,10}`

` Ư (25)={1,5,25}`

` Ư(40)={1,2,4,5,7,10,20,40}`

` ƯC(10,25,40)={1,5}`

`c)`

`B(7)={0,7,14,21,..}`

`B(13)={0,13,26,...}`

`BCN N(7,13)=7*13=91`

`d)`

`B(4)={0,4,8,...}`

`B(6)={0,6,12,...}`

`B(8)={0,8,12,...}`

`BCN N(4,6,8)=2^3*3=8*3=24`