Cho ba số x;y;z thoa man: x-1/2=y-2/3=z-3/4
va 2x+3y-z=50
tìm x;y;z
cho x;y;z;t la 4 so khac 0 va thoa man cac dieu kien sau:
y^2=xz, z^2=yt, vay^3+z^3+t^3kac 0chung minh rang:
(y^3+z^3+x^3)/y^3+z^3+t^3=x/t
biet x;y;z thoa man: (x-1)/2 = (y-2)/3 = (z-3)/4 va x-2y+3z = -10
khi do x+y+z = ?
Biet x;y;z thoa man x-1/2=y-2/3=x-3/4 va x-2y+3x=-10. Khi do x+y+z =?
a, x/5=y/3 và 5x-3y=8
b, x/3=y/4 ; y/5 = z/7 va 2x+ 3y-z=124
c, 3x=2y ; 7y=5z va x-y+z=32
đ, 2x/3=3y/4=4z/5 và x+y+z=49
e, 2x=3y=5z va x+y-z=95
f, x-1/2=y-2/3=z-3/4 va 2x+3y-z=50
cho cac so x,y,z khac 0 va thoa man \(\frac{1}{x}+\frac{1}{y}+\frac{1}{z}=0\) Chung minh rang x2(y+z)+y2(z+x ) +z2(x+z)+3xyz
ai nnha nhat minh tik dung luon
cho x,y,z thoa man x/2=2y/3=3z/4 va x-y=15. khi do x-y-z la
cho 3 so x;y;z thoa man 3x =2y ; 7y=5z va x+z-y =32 . khi do x+y-z= ?
cho x,y,z la cac so tu nhien thoa man 2x+3y-5z+19=0 va (x-1)/2=(y+3)/3=(z-1)/4 hay tim so du khi chia x^2010+y^2010+z^2010 cho 4