设ab>0,cd>0,有如下四个结论:(1)如果ad>bc,则必定有ab>cd; 发布时间:2017-04-21 04:23 │ 来源:www.tikuol.com 题型:填空题 问题: 设ab>0,cd>0,有如下四个结论:(1)如果ad>bc,则必定有ab>cd;(2)如果ad>bc,则必定有ab<cd.(3)如果ad<bc,则必定有ab<cd;(4)如果ad<bc,则必定有ab>cd.其中正确结论的个数是______.
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