ok bai mao dau nen beo lem khoi suy nghi cung tra loi dc:(tru cau b minh ko bit lam)
cho 2 nghuyen to X,Y
X: 3 lop e ,co so e doc than toi da
Y: 3 lop e, co 7 e hoa tri
a) xac dinh x,Y
b)cau truc hinh hoc XY3,XY5? dang lai hoa
C)pt pu XY3 voi 02, XY5 voi mot it H2O
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