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360P
简便计算：51×121+77×78，老师写完第一步，班上学生都会了
简便计算和速算技巧196/206
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App02:19App02:11App03:27App01:46App02:54App02:05App02:15App02:01App02:15App03:17App03:53App02:38![太仆寺旗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/ok5ZBQ8MGIKe7hOBIR7ejyfEICuAEQbSWDctQA~tplv-pk90l89vgd-fglass:864:486:90.jpeg?appId=32&biz_tag=list_custom%2Fnone&channelId=0&customType=custom%2Fnone&from=101_middle_image&imageType=list&isImmersiveScene=0&is_stream=0&lk3s=9d3f5bff&logId=202412210946343351CF15A9D235706AE1&requestFrom=101&x-expires=1766281595&x-signature=iG6DAcu%2FBX4euICpsTYd5f%2FxH34%3D)
