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Những câu hỏi liên quan
NL
4
15 tháng 5 2017
xy + x - y = 6
\(\Rightarrow x\left(y+1\right)-y-1=5\)
\(\Rightarrow x\left(y+1\right)-\left(y+1\right)=5\)
\(\Rightarrow\left(x-1\right)\left(y+1\right)=5\)
Ta có bảng sau:
| x - 1 | 1 | -1 | 5 | -5 |
| y + 1 | 5 | -5 | 1 | -1 |
| z | 2 | 0 | 6 | -4 |
| y | 4 | -6 | 0 | -2 |
Vậy...
MN
3 tháng 8 2018
I live in Tan Phong village and it is my hometown , too . My hometown is a small village but it is very beautiful . It's in the North of Viet Nam . There is a small river around my village . In the summer , children often go here and swim in it . Some fishermen usually catch fish here and take them to the market . There aren't many traffic here but there are many trees here . People are also friendly and kind . In my village , there are many houses such as : two floor houses , one floor house , ... In the morning , the cock is like an alaem clock for everyone . It crow to everyone get up . The life in my village is vey busy . I love my hometown very much because i have many nice memories with it .
N
3
31 tháng 12 2021
Bài 2:
b: \(=\left(x-y\right)\left(x+y\right)+\left(x-y\right)=\left(x-y\right)\left(x+y+1\right)\)
LT
0
LT
0
DT
11 tháng 12 2021
1, chỉ cách làm mẫu nek:
NO+O2=>NO2
NO+O2 là vế 1, NO2 là vế 2
vế 1 : N=1, O=3
vế 2 : N=1, O=2
cân bằng:
vế 2: 2O2( O vế 2 ít ng tử hơn )
lúc này vế 2 có O=4 vàN=2
vế 1: 2NO
lúc này vế 1 N=2, O=4
kl : 2NO+O2=>2NO2
2 , làm y như nãy:
4P+5O2=>2P2O5
3, Fe2O3+3H2SO4=>Fe(SO4)3+3H2O
16 tháng 12 2021
Question 1: B
Question 2: D
Question 3: B
Question 4: B
Question 5: C
Question 6: A
it rained heavily yesterday, so we couldn'd go to school
1. It rained heavily yesterday so we couldn't go to school