用细小的木条做一个长20cm，宽10cm，高8cm的长方形框架，至少需要多少cm的小木条
\u5728\u4e00\u4e2a\u957f20cm\uff0c\u5bbd10cm\uff0c\u7684\u957f\u65b9\u5f62\u91cc\u9762\u753b\u4e00\u4e2a\u6700\u5927\u7684\u5706\uff0c\u8fd9\u4e2a\u5706\u7684\u534a\u5f84\u662f\uff08 )cm?\u5706\u7684\u76f4\u5f84\u662f\u5bbd\u7684\u957f
\u534a\u5f84\u662f\uff1a10\u00f72=5cm
\u5728\u4e00\u4e2a\u957f20cm\uff0c\u5bbd10cm\uff0c\u7684\u957f\u65b9\u5f62\u91cc\u9762\u753b\u4e00\u4e2a\u6700\u5927\u7684\u5706\uff0c\u8fd9\u4e2a\u5706\u7684\u534a\u5f84\u662f\uff085 )cm
\u7528\u4e00\u5f20\u957f\u65b9\u5f62\u7eb8\u5377\u6210\u4e00\u4e2a\u4f4e\u9762\u76f4\u5f84\u662f10cm,\u9ad820cm\u7684\u5706\u67f1\u4f53(\u63a5\u5934\u4e0d\u8ba1),\u8fd9\u5f20\u957f\u65b9\u5f62\u7eb8\u7684\u957f\u662f\uff0831.4\uff09cm,\u5bbd\u662f( 20)cm
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绛旓細濡傚浘鎵绀
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绛旓細闀夸负:156梅4-12-7=39-19=20cm
绛旓細2.9.9
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绛旓細21闄や互3=7 澶氫簡1 鍑忓幓涓1 涓夎竟涓 7 7 6锛岀瓑鑵颁笁瑙掑舰
