ta có : \(4x\left(x+y\right)\left(x+y+z\right)\left(x+y\right)y^2x^2=4x\left(x+y+z\right)\left(x+y\right)^2y^2x^2\)
không thể khẳng định đc \(\Rightarrow\) bn xem lại đề .
cho 3 số x,y,z khác 0 thỏa mãn 1/x+1/y+1/z=0 gia tri bieu thuc K=(xy/z^2+yz/x^2+xz/y^2-2)^2017 là
cho 2 so x, y thoa man: x2+x2y2-2y=0 va x3+ 2y2-4y+3=0
tinh gia tri cua bieu thuc Q=x2+y2
tinh gia tri cua bieu thuc A=\(x^3+y^3+3xy\left(x^2+y^2\right)+6x^2y^2\left(x+y\right)\)
tinh gia tri cua cac bieu thuc sau:
a,x(x-6)-y(6-x) tai x=2006,y=2002
b,5x(x-y)-y(x-y) tai x=60,y=5
cho bieu thuc A=[x+2/x^2-x+x-2/x^2+x].x^2-1/x^2+2
a) tim dieu kien cua x de gia tri cua bieu thuc A duoc xac dinh
b) tinh gia tri cua bieu thuc A voi x = -200
tinh gt cac bieu thuc sau :
a, A=(x^2y+y^3) (x^2+y^2)-y(x^4+y^4)
b,B=(2x-y) (2x+y)-100
voi x=-25 , y=10
cho x+y+z=3 tim gtln cua bieu thuc P=xy+yz+zx
chung minh rang x^2-x+3/4>0voi moi gia tri cua x
Bai 1: Cho bt
P=(\(\dfrac{x-2}{x^2-1}\)-\(\dfrac{x+2}{x^2+2x+1}\)).(\(\dfrac{1-x^2}{2}\))2
a, Rut gon P
b, Tim x de \(\dfrac{P-4}{5}\)=x
Bai 2:Chung minh bieu thuc A=\(\dfrac{3}{2}\)-\(\dfrac{x}{x^2+x+1}\) luon duong voi moi x