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Xét X:

`2p_X+n_X=16`

`->n_X=16-2p_X`

`n_X-p_X\le 1`

`->16-2p_X-p_X\le 1`

`->p_X\ge 5(1)`

`n_X\ge p_X`

`->16-2p_X\ge p_X`

`->p_X\le 5,33(2)`

`(1)(2)->p_X=5(B)`

`n_X=16-2.5=6`

`A_X=5+6=11`

KHNT: \(_{5}^{11}B\)

Xét Y:

`2p_Y+n_Y=58`

`->n_Y=58-2p_Y`

`n_Y-p_Y\le 1`

`->58-2p_Y-p_Y\le 1`

`->p_Y\ge 19(1)`

`n_Y\ge p_Y`

`->58-2p_Y\ge p_Y`

`->p_Y\le 19,33(2)`

`(1)(2)->p_Y=19(K)`

`n_Y=58-2.19=20`

`A_Y=19+20=39`

KHNT: \(_{19}^{39}K\)

Xét Z:

`2p_Z+n_Z=78`

`->n_Z=78-2p_Z`

`n_Z-p_Z\le 1`

`->78-2p_Z-p_Z\le 1`

`->p_Z\ge 25,7(1)`

`n_Z\ge p_Z`

`->78-2p_Z\ge p_Z`

`->p_Z\le 26(2)`

`(1)(2)->p_Z=26(Fe)`

`n_Z=78-2.26=26`

`A_Z=26+26=52`

KHNT: \(_{26}^{52}Fe\)