tim cac so nguyen x va y sao cho (x^2-x+1)(y^2+xy)=3x-1
tìm x,y,z nguyên sao cho \(x^2+y^2+z^2+6< xy+3x+4z\)
Cho:
Q=(\(\dfrac{2x-x^2}{2x^2+8}\)-\(\dfrac{2x^2}{x^3-2x^2+4x-8}\)).(\(\dfrac{2}{x^2}\)+\(\dfrac{1-x}{x}\))
a, Tim dieu kien xac dinh
b, rut on q
c, Tinh Q khi x=2017
d, Tim x thuoc Z de Q thuoc Z
GIUP MINH VOI CAN GAP LAM!!!
Tìm x,y thuộc Z sao cho: x2 + xy + y = x + y
1, tìm cặp số nguyên x;y sao cho x2y+x+y chia hết cho xy2+y+1
cho x+y+z=2016 tinh gia tri a=( xy+2016 z)(yz+2016x)(zx+2016y)/(x+y)^2(y+z)^2(z+x)^2
Cho x, y, z dương thỏa mãn \(\left\{{}\begin{matrix}x^2+xy+y^2=1\\y^2+yz+z^2=\dfrac{1}{4}\\x^2+xz+z^2=\dfrac{3}{4}\end{matrix}\right.\)
Tính B=x+y+z
Cho x,y,z la cac so duong va x+y+z=1. Tim GTNN cua M=xy+yz+zx
Cho \(x^2+y^2+z^2=xy+xz+yz\)
CMR: x = y = z