【文档说明】二年级上册数学《连加、连减和加减混合》PPT课件-【人教版】.ppt,共(6)页,1.444 MB,由小喜鸽上传
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+5418-22-5418+22-5418-22+72943614725036582、下面的题目算错了吗?错在哪?64-(17+28)=1926+(86-59)=521728456419+-8659262652-+金钥匙配金锁游戏看哪把锁和钥匙能配在一起,改写成连加、连减,加减混合两步式题?392
910-682939-295180+202343+43394-22729+填上数,使三角形每条边上三个数的和相等。30621820