tim x, y nguyen thaoa man 1/x +1/y=1/8
tim x,y la so nguyen thoa man 1/x +1/y=1/8
Tim cac so nguyen thoa man (x+y)^2=(x-1)(y+1)
tim cac so nguyen x,y thoa man: 1/x-1/3=1/y voi x,y khac 0
a)Tim cap (x,y) nguyen duong thoa man xy=3(y-x)
b)cho 2 so x,y >0 thoa man x+y = 1
Tim GTNN cua M=(x^2+1/y^2)(y^2+1/x^2)
mình biết làm nhưng dài quá bạn tra trên google là đc
tim cac so huu ti x y thoa man x+y va 1/x +1/y nguyen duong
Tim x,y,z nguyen duong t/man 1/x +1/y +1/z=2
Tim x,y nguyen thoa man 1+can(x+y+3)=canx+can y
tim so nguyen x , y thoa man : x - 2.x.y + 3.y = 1
<=> 2(x - 2xy + 3y) = 2.1
<=> 2x - 4xy + 6y = 2
<=> [2x - (4xy - 6y) ] - 3 = 2 - 3
<=> 2x - 3 - 2y(2x - 3) = - 1
<=> (2x - 3)(1 - 2y) = - 1
=> (2x - 3)(1 - 2y) = - 1.1 = 1.( - 1 )
Nếu 2x - 3 = 1 thì 1 - 2y = - 1 => x = 2 thì y = 1
Nếu 2x - 3 = - 1 thì 1 - 2y = 1 => x = 1 thì y = 0
Vạy ( x;y ) = { ( 2;1 );( 1; 0 ) }
cam on cach giai cua ban , mk cung co thu 1 cach thi dc ket qua nay ( x,y ) = { ( 1 ; 1 ) ; ( 2; 0 ) }