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I don't finish their homework. That makes my teacher very angry
=> I didn't finish their homework which makes my teacher very angry.
1 Money is collected by Tim
2 The window was opened by Mai
3 Our homework has been done by us
4 A question will be asked by me
5 The picture can be cut by him
6 Our room aren't cleaned by us
7 The car won't be repaired by David
8 Was this circle drawn by Sue?
1 What can you speak
2 How does she go to school
3 When did your mother visit HLB
4 How often does your grandfather listen to the radio
5 Who give you a present on your birthday party
1 C
các cụm từ cố định: at the top of
2 D ở đây loại a/an vì là số nhiều, the không thể dùng vì được nói đến lần đầu tiên
3 C
cụm cố đinh: the only
4 the
the đứng trước những địa điểm công cộng: cinema, theater, post office,.....
5 B
Sự việc được nói đến lần đầu tiên, interesting kết thúc bằng nguyên âm => B
\(A=1^5+2^5+3^5+......+100^5\)
Ta luôn có \(a^n+b^n=\left(a+b\right)\left(.....\right)\) \(\text{∀}\) \(n\) ∈ \(N\) , \(n:\) \(lẻ\)
\(A=\left(1^5+99^5\right)+\left(2^5+98^5\right)+.....+\left(49^5+51^5\right)+100^5+50^5\)
\(A=\left(99+1\right)\left(...\right)+\left(2+98\right)\left(....\right)+....+\left(49+51\right)\left(....\right)+100^5+50^5\)
\(A=100\left(...\right)+\left(40+10\right)^5\)
\(Đặt\) \(P=\left(40+10\right)^5=40^5+10^5+5.40^4.10+10.40^3.10^2+10.40^2.10^3+5.40.10^4+10^5\)
Dễ thấy \(P\) ⋮ 4 \(=>A\) ⋮ 4 \(=>\) đpcm