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Q
20 tháng 6 2021
a, \(I_1=I_3=2I_2\)
\(I_2=\dfrac{7,8}{12}=0,65\left(A\right)\) \(\Rightarrow I_3=I_1=1,3\left(A\right)\)
\(\Rightarrow U_3=7,8-U_1=7,8-1,3.4=2,6\left(V\right)\)
\(\Rightarrow R_3=\dfrac{2,6}{1,3}=2\left(\Omega\right)\)
b, k đóng ta có mạch (R1//R2)nt(R3//R4)
\(\Rightarrow R_{tđ}=\dfrac{4.6}{10}+\dfrac{2.6}{8}=3,9\left(\Omega\right)\)
\(\Rightarrow I_k=\dfrac{7,8}{3,9}=2\left(A\right)\)
\(\Rightarrow U_{12}=\dfrac{4.6}{10}=2,4\left(V\right)\)
\(\Rightarrow U_{34}=2.1,5=3\left(V\right)\)
\(\Rightarrow I_1=\dfrac{2,4}{4}=0,6\left(A\right);I_2=\dfrac{2,4}{6}=0,4\left(A\right)\)
\(\Rightarrow I_3=\dfrac{3}{2}=1,5\left(A\right);I_4=\dfrac{3}{6}=0,5\left(A\right)\)
LB
1
25 tháng 8 2021
Câu 3:
2: Xét tứ giác OKEH có
\(\widehat{OKE}=\widehat{OHE}=\widehat{KOH}=90^0\)
Do đó: OKEH là hình chữ nhật
mà đường chéo OE là tia phân giác của \(\widehat{KOH}\)
nên OKEH là hình vuông
NC
1
DT
Đỗ Thanh Hải
CTVVIP
13 tháng 5 2021
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
DT
Đỗ Thanh Hải
CTVVIP
13 tháng 5 2021
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
NV
Nguyễn Việt Lâm
Giáo viên
8 tháng 1 2023
\(A=2^{2022}-2^{2020}+...+2^2-1\)
\(\Rightarrow4A=2^{2024}-2^{2022}+...+2^4-2^2\)
\(\Rightarrow A+4A=2^{2024}-1\)
\(\Rightarrow5A=2^{2024}-1\)
Đồng thời: \(B=2^{2023}\Rightarrow2B=2^{2024}\)
Mà \(2^{2024}>2^{2024}-1\)
\(\Rightarrow5A< 2B\)
AH
Akai Haruma
Giáo viên
12 tháng 2 2022
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: $10:48.100=20,83$ (%)
20 tháng 6 2021
a, khi K mở \(=>[\left(R1ntR2\right)//\left(R3ntR4\right)]ntR5\)
ampe kế chỉ 0,5A\(=>I\left(A\right)=Im=I5=I1234=0,5A\)
\(=>U5=I5.R5=0,5.15=7,5V\)
\(=>U1234=Um-U5=12-7,5=4,5V\)
\(=>R1234=\dfrac{U1234}{I1234}=\dfrac{\left(R1+R2\right)\left(R3+R4\right)}{R1+R2+R3+R4}\)
\(< =>\dfrac{4,5}{0,5}=\dfrac{\left(12+R2\right)\left(4+8\right)}{24+R2}=9=>R2=24\left(om\right)\)
1.My painting is not as expensive as this painting
2.His book is diffirent from mine
3.The Temple of Literature is visited by thousands of people
4.Peter has collecting stamps for two years