cac ban tra loi giup minh voi
Ta có:2x+5y=14
Vì\(2x⋮2;14⋮2\)nên
\(\Rightarrow5y⋮2\)
Mà (5,2)=1
\(\Rightarrow y⋮2\left(1\right)\)
Ta lại có:\(2x+5y=14\)
Mà \(x,y\inℤ^+\)nên
\(\Rightarrow5y< 14\Rightarrow0< y< 3\left(2\right)\)
Từ (1) và (2)
Suy ra y=2
\(\Rightarrow2x+5.2=14\)
\(\Rightarrow2x+10=14\)
\(\Rightarrow2x=4\Rightarrow x=2\)
Vậy x=y=2
a, Tim cac so nguyen duong x,y nho hon 10 sao cho 3x - 4y = -21
b, tim cac so nguen x,y sao cho xy -2x + 5y -12 = 0
tim cac so nguyen duong x,y thoa man 2x+3y=14
Bai 1 : Tim cac so nguyen x , y biet :
a, xy - 2x -3y = 5
b, xy - 2x + 5y = 2
Bai 1 : Tim cac so nguyen x , y biet :
a, x +xy + y = 9
b, xy - 2x -3y = 5
c, xy - 2x + 5y = 2
Tim 3 so nguyen duong biet tong cua chung bang nua tich chung
Trong 3 so a,b,c co 1 so nguyen a,1 so nguyen duong va1 so bang 0
tim 3 so do biet :IaI=b^2(b-c)
tim cac so nguyen duong x;a;b biet 4x+9=3^a;2x+5=3^b
Tim hai so nguyen duong x,y biet x/y = -21/-91 va UCLN(x,y) =5
