Giai giup minh vss 👉👈💖
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Nam and his family visited Son Dong Cave happily last summer
=>Son Don Cave was visited happily by Nam and his family last summer
Bài giải
1 chục = 10 . Vậy số chim bay đi là 10 con.
Số con chim trên cành còn :
20 - 10 = 10 ( con )
Đáp số : 10 con
Giải
Đổi : 1 chục = 10
Còn số con chim trên cành là
20 - 10 = 10 ( con chim )
Đáp số : 10 con chim
a, Vì b và c cùng vuông góc với d nên b//c
b, Vì b//c nên \(\widehat{A}=\widehat{ABc}=120^0\left(so.le.trong\right);\widehat{A}=\widehat{BCa}=120^0\left(đồng.vị\right)\)
Ta có \(\widehat{ABc}+\widehat{ABC}=180^0\left(kề.bù\right)\Rightarrow\widehat{ABC}=180^0-120^0=60^0\)
Ta có \(\widehat{aBc}=\widehat{ABC}=60^0\left(đối.đỉnh\right)\)
vì b//c
=> \(\widehat{DAB}+\widehat{ABC}=180\) ( 2 góc trong cùng phía bù nhau )
=> \(120+\widehat{ABC}=180=>\widehat{ABC}=60\)
=> \(\widehat{ABC}=\widehat{cBa}=60\) ( đối đỉnh)
\(\widehat{ABC}+\widehat{ABc}=180\) ( 2 góc kề bù)
=> \(60+\widehat{ABc}=180=>\widehat{ABc}=120\)
\(\widehat{ABc}=\widehat{aBC}=120\) đối đỉnh
Giải:
\(A=\dfrac{1}{7}+\dfrac{1}{91}+\dfrac{1}{247}+\dfrac{1}{475}+\dfrac{1}{775}+\dfrac{1}{1147}\)
\(A=\dfrac{1}{1.7}+\dfrac{1}{7.13}+\dfrac{1}{13.19}+\dfrac{1}{19.25}+\dfrac{1}{25.31}+\dfrac{1}{31.37}\)
\(A=\dfrac{1}{6}.\left(\dfrac{6}{1.7}+\dfrac{6}{7.13}+\dfrac{6}{13.19}+\dfrac{6}{19.25}+\dfrac{6}{25.31}+\dfrac{6}{31.37}\right)\)
\(A=\dfrac{1}{6}.\left(1-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{13}+\dfrac{1}{13}-\dfrac{1}{19}+\dfrac{1}{19}-\dfrac{1}{25}+\dfrac{1}{25}-\dfrac{1}{31}+\dfrac{1}{31}-\dfrac{1}{37}\right)\)
\(A=\dfrac{1}{6}.\left(1-\dfrac{1}{37}\right)\)
\(A=\dfrac{1}{6}.\dfrac{36}{37}\)
\(A=\dfrac{6}{37}\)
\(6A=\dfrac{6}{1.7}+\dfrac{6}{7.13}+\dfrac{6}{13.19}+...+\dfrac{6}{31.37}\)
= \(1-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{13}+\dfrac{1}{13}-\dfrac{1}{19}+...+\dfrac{1}{31}-\dfrac{1}{37}=\dfrac{36}{37}\)
<=> A = \(\dfrac{6}{37}\)
a) vì các đèn mắc song song nên
\(U=U_1=U_2=2,8V\)
b)vì các đèn mắc song song nên
\(I=I_1+I_2\)
\(=>I_1=I-I_2=0,45-0,22=0,23A\)
1 A
2 C
3 A
4 A
5 A
6 D
7 C
8 A
9 D
10 D
III
11 D
12 C
13 B
14 D
15 D
16 D
17 B
37 D
39 C
40 C
41 C
42 C
43 A
44 C
45D
V
46 mine
47 ours
48 theirs
49 Nick's
50 Hers
51 yours
52 theirs
53 yours
54 Ann's
55 theirs
VI
56 What are you looking for?
57 What are used to reduce energy in that area?
58 What do you learn to reuse some daily products like empty bottle for?
96 What do people from the countryside move to city to find?
60 Why do people like using urban transport pods?
61 F
62 T
63 F
64 T
65 T
66 The shortages of both food and water
67 It pollute cleam water
68 It kills another 4 million people every year
69 Crime and violence
70 Because of the economic pressure caused by heat and drought
Cam on nhieuu