tim x,y thuoc Z biet x^2+6x=y^2
tim x;y biet
x-y=xy-1
cho x thuoc tap so nguyen biet
x^3 -x^2 -2x^2 +2x chia het cho 6
tim x,y.z,t biet: |x-y|+|y-z|+|z-t|+|t-x|=2015
tim x,y thuoc N thoa x^2+27=y^2
tim x,y thuoc Z
x.( y -2 ) + 2.y = 8
x -1 /y + 5 = 1/5 va x+ y = 4
tim x,y thuoc N sao x^2+3^y=35
biet xy+yz+xz=5(x,y, thuoc N)
tim gia tri nho nhat cua bieu thuc sau
3x^2+3y^2+z^2
bạn jup mik nha mik ***** choa
biet (x+y+2)(xy+2x+2y)=2xy Chung minh rang (x+y+2)^2015=x^2015+y^2015+2^2015
tim x thuoc Z biet (x+5)(3x-12)>0
ai giai duoc minh lik e cho
