x + y = -5 ; y + z = -16 ; z + x = 19 => (x+y) + (y+z) + (z+x) = 2(x+y+z) = -5 + (-16) + 19 = -2
=> x + y + z = -2 : 2 = -1 => x = -1 - (-16) = 15 ; y = -1 - 19 = -20 ; z = -1 - (-5) = 4
tim ba số x,y,z biết :x+y=2,y+z=3,z+x=-5 x= y= z
tim x,y,z biet x+y=5; x+z=7; y+z=9
bai 1 tim cac so nguyen x,y biet
a,x/3=7/y b,x/y=-3/11 c,x/y-1=5/-19
bai 2 tim cac so nguyen x,y,z,t biet
12/-6=x/5=-y/3=z/-17=-t/-9
Tim cac so nguyên x,y,z biet
x+y=2,y+z=3,x+z=-5
tim x,y thuộc Z
a/ (x+5)(y-3)=11
b/xy-2y=-19
tim cac so nguen x,y,z:x/y+y/z+z/x=y/x+z/y+x/z=x+y+z=3
tim x y z biet
x/12=y/9=z/5 va x+y+z=52
Tim cac so nguyen x, y, z thoa man x/y +y/z+z/x =y/x+/y+x/z=x+y+z=3
cho các so tu nhien x,y,z,t nho nhat thoa man x/y=5/14;y/z=21/28;z/t=6/11.tim x,y,z,t
