1. B

2. A

3. B

4. A

5. C

\(Zn+2HCl\) → \(ZnCl_2+H_2\)

1.She told me to wait there

2.She warned me not to do that

3.She told me to eat my dinner

4.She told me not to make a mess

5.She told me to do the washing-up

untrueful

Chứng minh với mọi a,b,c,d ta luôn có \(a^4+b^4+c^4+d^4\) ≥ 4abcd

chắc là bị lỗi hay làm sao thôi

bạn chịu khó đăng bài lại nha

1. 2KClO₃ → 2KCL + 3O₂

2. O₂ + H₂ → H₂O

3. H₂O + SO₃ → H₂SO₄

4. 2Al + 3H2SO4 → Al2(SO4)3 + 3H2

5. H₂O + Na → NaOH

1. was watching

2. wanted

3. have learnt

4. be built

da diết