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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
Rtđ = R1 + R2 =10 + 20= 30 (Ω)
Cường độ dòng điện chạy qua đoạn mạch
I = \(\dfrac{U}{Rtđ}=\dfrac{6}{30}=0,2\left(A\right)\)
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: $10:48.100=20,83$ (%)
giúp j?????