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利用内角和求角度问题，很多同学会做却总得一半分，怎么回事
越简单，越易错，多画图，细思考。
北师版四年级下册各单元常考易错题汇总8/16
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App02:55越简单，越易错，多画图，细思考。
App04:09App05:34App03:09App03:10App05:40App04:30App05:17App03:19App07:27App03:32App04:37App04:52App02:21App03:40App02:53App02:55
