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小升初数学经典题：翻开学霸的笔记本，思索了一节课，也没思路。
如图： 矩形ABCD中. S矩形ABCD=60cm2. DM:AM=1:3. BN:AN =1:2. 求蓝色部分面积。
小升初数学集107/131
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![方山县气象台发布道路结冰黄色预警[Ⅲ级/较重]](http://p26-sign.bdxiguaimg.com/tos-cn-p-0015/oowmICc9jDA0kR3nVEFlA9nDyAZgWBeRQrfmIE~tplv-pk90l89vgd-fglass:864:486:90.jpeg?appId=32&channelId=0&customType=custom%2Fnone&from=101_middle_image&imageType=list&isImmersiveScene=0&is_stream=0&lk3s=9d3f5bff&logId=202411281847560D0DE2B684C8A7465A16&requestFrom=101&x-expires=1764326876&x-signature=igGsD3idzs3ePWZn4NKxH6Vm9g4%3D)
