Question

求证7/8≤a/(b+c+1)+b/(c+a+1)+c/(a+b+1)+(1-a)(1-b)(1-c)

Answer 1

如果会3/4≤a/(b+1)+b/(a+1)+(1-a)(1-b),那么就会做7/8≤a/(b+c+1)+b/(c+a+1)+c/(a+b+1)+(1-a)(1-b)(1-c) .好像要用到拆分,但具体步骤我忘记了,所以,没法帮你.