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51 Because it rained heavily, we were late for school

52 We used to be made to clean the house by my mother

53 She said she was working in a restaurant, and didn't care much for it

54 I haven't spoken to her for 2 years

55 It is interesting to go swimming in the river in the summer

46 They wish they didn't have to work in a noisy office

47 They used to make a lỏ of mistake in spelling

48 It's high time you went to bed

49 Neither my sister nor I am good at swimming

50 If he works hard, he will pass the exam

51 The last time I was to a concert was over a year ago

52 I wish I were able to fly a plane

53 I'm bored with this film

54 My question hasn't been answered properly

55 If she were on booard now, she could experienced these maverlous things

\(A=2^{2022}-2^{2020}+...+2^2-1\)

\(\Rightarrow4A=2^{2024}-2^{2022}+...+2^4-2^2\)

\(\Rightarrow A+4A=2^{2024}-1\)

\(\Rightarrow5A=2^{2024}-1\)

Đồng thời: \(B=2^{2023}\Rightarrow2B=2^{2024}\)

Mà \(2^{2024}>2^{2024}-1\)

\(\Rightarrow5A< 2B\)

a) điện trở tương đương của đoạn mạch

R_tđ = R1 + R2 =10 + 20= 30 (Ω)

Cường độ dòng điện chạy qua đoạn mạch

I = \(\dfrac{U}{Rtđ}=\dfrac{6}{30}=0,2\left(A\right)\)

b) vì R1 nối tiếp R2  nên ta có:

I= I1= I2 = I3= 0,2 (A)

-> U1= I1 . R1 = 0,2 .10 = 2 (V)

-> U2 = I2 . R2 = 0,2. 20 = 4 (V)

Lời giải:
a. Số hs lớp 6D là: $2+4+7+15+10+6+4=48$ (hs) 

b. Số hs điểm giỏi là: $6+4=10$ (hs) 

Số hs điểm giỏi chiếm số phần trăm là: $10:48.100=20,83$ (%)

đề ghi rõ ra dc ko ạ=^=

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