在移动端有三张图片，其中有两张的尺寸是一样的，还有一张要比其它两张小2px
用flex怎么让他们能自适应???

 <p class="flexbox">
            <p>
                <a href="http://m.vmei.com/brand/group/1000284">
                    <img src="http://img01.sephome.com/201512/E99EB7375ADB4E4CB717B30EEF130A61.jpg" alt="" width="100%">
                </a>
            </p>
            <p>
                <a href="http://m.vmei.com/brand/group/1000284">
                    <img src="http://img01.sephome.com/201512/2221C6D38DCF4E3DB0F6D5F5B4A31D1F.jpg" alt="" width="100%">
                </a>
            </p>
            <p>
                <a href="http://m.vmei.com/brand/group/1000421">
                    <img src="http://img01.sephome.com/201512/975A099F4CDE42FAAD13FD89002341A0.jpg" alt="" width="100%">
                </a>
            </p>
        </p>
        
         .flexbox{
            display: flex;
            display: -moz-box;
            display: -webkit-flex;
        }
        .flexbox p{
            float: left;
        }
        .flexbox p:nth-of-type(1),.flexbox p:nth-of-type(3){
            flex:1;
        }