Kết quả tìm kiếm

1) I would like to devote more time to my wife and children. (dedicate) 2) Much to the surprise of the band, there's been a huge call for their latest album. (demand) 3) It seems that the older I get, the more I desire the return of my childhood years. (long) 4) Jody was being very modest when...

Cho x,y,z >0 thoả x+y+z = xyz CMR: $\dfrac{x}{1+x^2}$ + $\dfrac{2y}{1+y^2}$ + $\dfrac{3z}{1+z^2}$ = $\dfrac{xyz(5x+4y+3z)}{(x+y)(y+z)(z+x)}$

$\text{Cho a,b,c,x,y,z thuộc R* thỏa:} $ $\dfrac{a}{x}$ + $\dfrac{b}{y}$ + $\dfrac{c}{z}$ = 0 và $\dfrac{x}{a}$ + $\dfrac{y}{b}$ + $\dfrac{z}{c}$ = 1. $\text{CMR:} $ $\dfrac{x^2}{a^2}$ + $\dfrac{y^2}{b^2}$ + $\dfrac{z^2}{c^2}$ = 1

Cho 3 số thực x;y;z thỏa: 3(x+y) + 2(z+1) = 0 3xy + 1 = 0 Rút gọn biểu thức sau: A = $\frac{x^3 - y^3 +(z+1)(x^2-y^2)-x+y}{(x-y)^3}$