giúp mik vs mik tick bn nào nhnh nất ,đúng chỉ làm bài 4,5 thôi

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2 dreamed/dreamt
3 were taking
4 was
5 were
6 were travelling
7 was
8 were sitting
9 were drinking
10 were dancing
11 was playing
12 had
13 arrived
14 was waiting
15 stayed
16 were beating
17 were singing
18 were dancing
19 was getting
20 heard
21 was
22 was
3.
Lớp 4A trồng được số cây là:
(600-50):2= 275 (cây)
Lớp 4B trồng được số cây là:
600-275= 325 (cây)
Đáp số: Lớp 4A: 275 cây
Lớp 4B: 325 cây
A={0;1;2;3;4;5;6;7;8} - cách 1
A={X {kí hiệu thuộc} N/X<9}- cách 2
k nha