Itriedtoplayagame,butitdidnotworkverywell.->.slide-1img{min-height:480px;}
MyHTMLandCSScode:
.slide{width:100%; height:480px; margin-top:40px;}
.slide img{display:block;}
.slide-1{width:60%; float:left;}
.slide-2, .slide-3{width:40%; float:right;}
<div class="slide">
<div class="slide-1">
<img src="img/img-slide-1.jpg" alt="">
</div><!--FECHAMENTO DE TAG-->
<div class="slide-2">
<img src="img/img-slide-2.jpg" alt="">
</div><!--FECHAMENTO DE TAG-->
<div class="slide-3">
<img src="img/img-slide-3.jpg" alt="">
</div><!--FECHAMENTO DE TAG-->
</div>