my laptop key has stop function. all the key of N0 1,2,3,4,5,6,7,8,9,0 and if you press button M it shows like thus 7m and V it shows like thus 4V and zero it shows like this 0\, Z it shows 1Z, X shows 2X and the rest of numbers
Depending on how old the laptop is, you can buy a new keyboard from e-bay for about £12-15
It should work if you buy a new on and fit it.
If you have split any fluid on the keyboard then it is likely the liquid is causing the problem.
take the battery out of the laptop and put it in a warm aired place leave it for a few days and the key board may work again.