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1) an = a.a.a....a (a khác 0)
n chữ số a
2) an . am = am+n
3) an : am = an- m ( a khác 0 , n lớn hơn n hoặc m)
4)a0 = 1 ( a khác 0)
5)a1 = a
6)0n = 0 ( n thuộc N*)
7) 1n = 1
- Khẳng định (+): S + have / has + V(ed/v3)
- Phủ định (-): S + haven't / hasn't +V(ed/v3)
- Nghi vấn (?): Have/Has + S+ V (ed/v3) ?
- Từ để hỏi (question words): Question Words + Have/Has + S + V(ed/v3) ?
1 Should she feel tired, let us know right away.
2 Should you be busy then, I'll take care of that.
3 Were I you, I would never talk to my parents like that.
4 Were we to have more money, we could buy this house.
5 Had he not cheated, she wouldn't have broken up with him.
6 Had our daughter been more hard-working, she could have gotten into that university.
7 Had our son not gone to bed late last night, he wouldn't be sleepy now.
8 Had the kids cleaned the house this morning, we wouldn't have to do this now.
9 Were that guy friendlier, he could have made a lot of friends at the party last night.
10 Were I you, I would have taken the job.
#\(Cụt\)
#\(yGLinh\)