Tim x;y;z biết xy/x+y = 6/5 ; yz/y+z = 15/8; xz/x+z = 10/7 ( x;y;z khác 0 )
tim x,y,z
xy+y=2 ; yz+y=6 ; xz+x+z=2
Tim x;y;z biết xy/x+y = 6/5 ; yz/y+z = 15/8; xz/x+z = 10/7 ( x;y;z khác 0 )
Giúp mk với, mk đang cần gấp
tìm x,y,z biết: xy=2, yz=6,xz=3
Tìm x;y;z biết xy=2;yz=6,xz=3
CMR;3^x+1+3^x+2+...+3^x+100 chia het cho 120
Cho biet xyz=1
Tinh gia tri A=x/xy+x+1+y/yz+y+1+z/xz+z+1
toan 7 tim x,y,z biet (xy/2y+4x)=(yz/4z+6y)=(zx/6x+2z)=(x^2+y^2+z^2)/2^2+4^2+6^2
cho biet xyz=1.tinh gia tri cua A=\(\frac{x}{xy+x+1}+\frac{y}{yz+y+1}+\frac{z}{xz+z+1}\)
cho x,y,z la cac so huu ti duong thoa man x+1/yz y +1/xz z+1/xy la cac so nguyen tim gia tri lon nhat cua bieu thuc A=x+y^2+z^3