Đáp án:
a)Vì `x,y in ZZ`
`=>x-3,y+2 in ZZ`
`=>x-3,y+2 in Ư(5)={+-1,+-5}`
`**x-3=1,y+2=5`
`=>x=4,y=3(tm)`
`**x-3=-1,y+2=-5`
`=>x=2.y=-7(tm)`
`**x-3=5,y+2=1`
`=>x=8,y=-1(tm)`
`**x-3=-5,y+2=-1`
`=>x=-2,y=-3(tm)`
Vậy `(x,y) in {(4,3),(2,-7),(8,-1),(-2,-3)}`
a)Vì `x,y in ZZ`
`=>x-2,y+1 in ZZ`
`=>x-2,y+1 in Ư(5)={+-1,+-5}`
`**x-2=1,y+1=5`
`=>x=3,y=4(tm)`
`**x-2=-1,y+1=-5`
`=>x=1,y=-6(tm)`
`**x-2=5,y+1=1`
`=>x=7,y=0(tm)`
`**x-2=-5,y+1=-1`
`=>x=-3,y=-2(tm)`
Vậy `(x,y) in {(3,4),(1,-6),(7,0),(-3,-2)}`
