若a+b大于0,a-b小于0,ab小于0,则a_0,b_0,/a/__/b/(添等号或不等号)

问题描述:

若a+b大于0,a-b小于0,ab小于0,则a_0,b_0,/a/__/b/(添等号或不等号)

a<0 b>0 /a/≠/b/