e viet theo STL nhung ma k su li dc tiemr trong nay...day la bai e lam...cac b sua ho e nha...ok
LD I0.0
O Q0.2
AN I0.1
= Q0.2
LD I0.2
O Q0.0
AN I0.3
A Q0.2
= Q0.0
LD I0.3
O Q0.1
AN I0.2
A Q0.2
= Q0
e viet the nao...e chua tim cach su li time dc...