Tìm x, y \(\in\)Z+ sao cho :
3x + 1 = ( y + 1 )2
Help me !!!! If someone helps me, i wil tick him three tick !!!
K
Khách
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A
14 tháng 4 2016
Phu Long is my village. every day, Phu Long is very busy but Phu Long is exciting village.
my family live here since I was three years old. Phu Long has a lot of beautiful flower.Phu Long has a lots of many primary school.
KS
1
LD
23 tháng 3 2018
=>4x-y-3x+y=8-(-5)=13
Hay x=13
=>3x=13x3=39
=>y=13-39=-26
Vậy x=13,y=-26
ND
Nguyễn Đức Trí
VIP
1 tháng 9 2023
a) \(a\left(b+1\right)=3\left(a;b\inℤ\right)\)
\(\Rightarrow a;\left(b+1\right)\in U\left(3\right)=\left\{-1;1;-3;3\right\}\)
\(\Rightarrow\left(a;b\right)\in\left\{\left(-1;-4\right);\left(1;2\right);\left(-3;-2\right);\left(3;0\right)\right\}\)
b) \(2n+7⋮n+1\left(n\inℤ\right)\)
\(\Rightarrow2n+7-2\left(n+1\right)⋮n+1\)
\(\Rightarrow2n+7-2n-2⋮n+1\)
\(\Rightarrow5⋮n+1\)
\(\Rightarrow n+1\in U\left(5\right)=\left\{-1;1;-5;5\right\}\)
\(\Rightarrow n\in\left\{-2;0;-6;4\right\}\)
c) \(xy+x-y=6\left(x;y\inℤ\right)\)
\(\Rightarrow x\left(y+1\right)-y-1+1=6\)
\(\Rightarrow x\left(y+1\right)-\left(y+1\right)=5\)
\(\Rightarrow\left(x-1\right)\left(y+1\right)=5\)
\(\Rightarrow\left(x-1\right);\left(y+1\right)\in U\left(5\right)=\left\{-1;1;-5;5\right\}\)
\(\Rightarrow\left(x;y\right)\in\left\{\left(-0;-6\right);\left(2;4\right);\left(-4;-2\right);\left(6;0\right)\right\}\)
FE
4
CW
4 tháng 12 2016
\(\frac{2004}{2005}\cdot\frac{2005}{2003}\cdot\frac{2003}{2004}=\frac{2004\cdot2005\cdot2003}{2005\cdot2003\cdot2004}=1\)
4 tháng 12 2016
\(\frac{2004x2005x2003}{2005x2003x2004}\)
Sau đó thì bạn chỉ cần rút gọn thui
15 tháng 3 2022
1.If I __________the same problem you had as a child, I might not have succeeded in life as well as you have.
a. have B. would have C. had had D. should have
2. I __________you sooner had someone told me you were in the hospital.
a. would have visited B. visited C. had visited D. visit
3. __________more help, I would call my neighbor.
a. needed B. should I need C. I have needed D. I should need
4. __________then what I know yesterday, I would have saved myself a lot of time and trouble over the years.
a. had I known B. did I know C. If I know D. If I would know
5. Do you think there would be less conflict in the world if all people __________the same language?
a. spoke B. speak C. had spoken D. will speak
A
15 tháng 3 2022
1.If I __________the same problem you had as a child, I might not have succeeded in life as well as you have.
a. have B. would have C. had had D. should have
2. I __________you sooner had someone told me you were in the hospital.
a. would have visited B. visited C. had visited D. visit
3. __________more help, I would call my neighbor.
a. needed B. should I need C. I have needed D. I should need
4. __________then what I know yesterday, I would have saved myself a lot of time and trouble over the years.
a. had I known B. did I know C. If I know D. If I would know
5. Do you think there would be less conflict in the world if all people __________the same language?
a. spoke B. speak C. had spoken D. will speak