thay met

chọn :

Must you come when your neighbor calls ? No, I...

A, must not

B, must

C, needn't

D, must not come

Ai bt chắc chắn k v ..

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Ko mua gì

Cò lùi = cò ko tiến = tiền ko có

Một phương trình bậc nhất một ẩn có mấy nghiệm ?