1)a,b,c 0 ; a+b+c1. CMR:
dfrac{a}{1+a} + dfrac{2b}{2+b} +dfrac{3c}{c+3} le dfrac{6}{7}
2) x,y,z 0; 4x+9y+16z49
CMR: dfrac{1}{x} + dfrac{25}{y} + dfrac{64}{z} ge 49
Đọc tiếp
1)a,b,c >0 ; a+b+c=1. CMR:
\(\dfrac{a}{1+a}\) + \(\dfrac{2b}{2+b}\) +\(\dfrac{3c}{c+3}\) \(\le\) \(\dfrac{6}{7}\)
2) x,y,z >0; 4x+9y+16z=49
CMR: \(\dfrac{1}{x}\) + \(\dfrac{25}{y}\) + \(\dfrac{64}{z}\) \(\ge\) 49