Ta có: \(x^2+45=y^2\Leftrightarrow y^2-x^2=45\Leftrightarrow\left(y-x\right)\left(y+x\right)=45=5.9\)
Do \(\left(5,9\right)=1\) và \(y+x>y-x\)
nên \(y+x=9;y-x=5\Leftrightarrow2y=14;y-x=5\Leftrightarrow y=7;x=2\)
Do đó, \(x+y=2+7=9\)
Ta có: \(x^2+45=y^2\Leftrightarrow y^2-x^2=45\Leftrightarrow\left(y-x\right)\left(y+x\right)=45=5.9\)
Do \(\left(5,9\right)=1\) và \(y+x>y-x\)
nên \(y+x=9;y-x=5\Leftrightarrow2y=14;y-x=5\Leftrightarrow y=7;x=2\)
Do đó, \(x+y=2+7=9\)
cho x,y la cac so nguyen to thoa man x^2+45=y^2.Tong x+y=
x,y la hai so nguyen to, x2+45=y2.tinh tong x+y
Cho x;y la so nguyen sao cho | x | + | y | = 5. So cap so nguyen ( x;y ) thoa man la
a, cho x,y la hai so nguyen duong , biet /x/+/y/= 20.Tinh x+y
b, cho x,y la hai so nguyen am, biet /x/+/y/= 20.Tinh x+y
cho x la tong tat ca cac so nguyen 2 chu so y la so nguyen am lon nhat.A=2009:x^2006-2008+y^2007
cho 2 so x;y la cac so nguyen sao cho :/x/ +/y/ = 2 so cap (x;y) thoa man la
cho x ; y la cac so nguyen to sao cho gia tri tuyet doi cua x cong gia tri tuyet doi cua y bang 5 so cap so nguyen (x;y) thoa man la
tim x dua vao quan he uoc boi:
tim so tu nhien x sao cho x-1 la uoc cua 12
tim so tu nhien x sao cho 2x+1 la uoc cua 28
tim so tu nhien x sao cho x+15 la boi cua x+3
tim cac so nguyen x,y sao cho (x+1)(y-2)=3
tim so nguyen x sao cho(x+2).(y-1)=2
tim so nguyen to x vua la uoc cua 275 vua la uoc cua 180
tim so nguyen to x,y biet x+y=12 va UCLL (x:y)=5
tim so tu nhien x,y biet x+y=32 va UCLL (x:y)=8
tim so tu nhien x biet x chia het cho10; xchia het cho12; x chia het cho15 va 100<x<150
tim so x nho nhat khac 0b biet x chia het cho 24 va 30
40 chia het cho x . 56 chia het cho x va x>6