tim x, y thuoc z biet :
/ x-y / + / y-z/ + /z - x / = 2015
cach lam bai : giup minh voi
tim x thuoc Z biet:
a, /x/+/y/=0
b, /x/ + /y/= 1
tim x,y thuoc Z biet x*y=x+y
tim x,y,z thuoc z biet /x/+/y/+/z/=0
tim x,y thuoc N,biet x<y:1/x+1/y=1/8
giup minh voi!
tim x ,y thuoc z biet: (x-1)(x+y) =32
tim x,y thuoc Z biet xy=x-y
tim x, y thuoc Z biet x+y -x.y = 7
cho a =2^x . 3^y voi z,y thuoc N* . biet a co 15 uoc . tim a
mấy bn giúp vs nhá
