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19 tháng 6 2018
gọi số đó là ab
ta có: ab=8x(a+b)
a x 10 + b =8 x a + 8 x b
a x 2=b x 7
vậy : ab =72
NV
19 tháng 6 2018
Gọi số đó là ab
Theo đề bài ta có:
ab = 8( a+ b )
10a + b = 8a + 8b
2a = 7b ( bớt mỗi bên đi 8a + b )
=> a = 7
b = 2
Vậy số cần tìm là 72
CÁC BẠN GIÚP MÌNH NHÉ MÌNH CẢM ƠN
5 tháng 9 2021
Bài 11:
a: \(4x^2-1=\left(2x-1\right)\left(2x+1\right)\)
b: \(25x^2-\dfrac{9}{100}=\left(5x-\dfrac{3}{10}\right)\left(5x+\dfrac{3}{10}\right)\)
c: \(9x^2-\dfrac{1}{4}=\left(3x-\dfrac{1}{2}\right)\left(3x+\dfrac{1}{2}\right)\)
d: \(\left(x-y\right)^2-4=\left(x-y-2\right)\left(x-y+2\right)\)
9 tháng 1 2023
trust
telling
Under
which
be invited
out
have
are taken
a
reading/watching
16 tháng 3 2023
\(n_{C_2H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
PT: \(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
Theo PT: \(n_{Br_2}=2n_{C_2H_2}=0,2\left(mol\right)\Rightarrow C_{M_{Br_2}}=\dfrac{0,2}{0,2}=1\left(M\right)\)
→ Đáp án: C
1 Show me the new hats which you bought last night
2 That is a company which produces diamond rings
3 My best friend who sings folk songs very well can compose songs
4 Zoe bought a new phone which is quite expensive yesterday
5 The man whom you met last week is her father
6 Zoe likes the blue T-shirt which she is wearing
7 Zoe has a sister whose name is Juma
8 The children were attracted by the show in which there were so many famous people
9 Tet is a festival that often happens in late January or early February
10 Jack is the boy who gave my mom a gift
1. Show me the new hats which you bought last night.
2. That is a company which produces diamond rings.
3. My best friend, who sings folk songs very well, can compose a song.
4. Zoe bough a new phone yesterday, which is expensive.
5. The man who you met last week is her father.
6. Zoe like the blue t-shirt which my sister is wearing.
7. Zoe has a sister whose name is Juma.
8. The children were attracted by the show which there were so many famous people.
9. Tet is a festival which often happens in late January or early February.
10. Jack is the boy who gave my mom a gift.