tim x;y;z;x va x;y;z khac 0 biet
(x.y-1)/y=(y.z-1)/z=(x.z-1)/x=1
tim x,y,z biet 4/x+1=3/z+2=2/y-2 va x.y=12
a,tim x biet |x-2|+|3-2x|=2x+1
b,tim x,y thuoc Z biet xy+2x-y=5
c, tinh A=(1-1/15)(1-1/21)(1-1/28).....(1-1/210)
tim 2 so x,y biet rang :x/2=y/5 va x.y=40
a, Tim x biet:/x-2/+/3-2x/=2x+1
b, Tim x,y thuoc Z biet:xy+2x-y=5
c, tim x,y,z, biet :2x=3y;4y=5zva 4x-3y+5z=7
cho x/4=y/5.tim x y biet a) x+y=54 b) 3x -2y=8 c) x.y=80
Tim hai so huu ti x, y( y khac 0), biet
x-y= x.y= x:y
tim hai so huu ti x va y(y khac 0) biet rang :
x-y=x.y=x:y
tim x , y biet :
2x+1/5=3y-1/7=2x+3y-1/6x
