... ()()()()222222222222yazbxczaxbycxyyzzxabbcca++++≥++++ Chapter 2: Starting From Some Special Fourth Degree Inequalities 2.3 Another related inequalities 1. Cho ,,0xyz≥ . Với 02r≤≤ . CMR : ()4442222223331xyzrxyyzzxrxyyzzx+++++≥+++ ... ()221,,2,4222qrEabcqrr+≥+≤≤++ c) CMR : ()()22,,4122,42,1Eabckrkqkrkk≥+−=+≥ 7.5 Inequalities Involving 1E and 2E 1. Cho ,,0abc≥ và 2 trong chúng không đồng thời bằng ... ()()()2212,0,14212rrrrrααβα+>−≥+−≤≤++− CMR : ()222222aabcbcbrbccrαββα+++≥+++++∑ 7.7 Other Related Inequalities 1. Cho ,,0abc≥ và 2 trong chúng không đồng thời bằng 0 . CMR : () () ()()2222222222222abcbcacababbccabccaab+++++≥+++++...