北师大版一年级上册数学总复习13123112191313121519197+9=_(颗)169时时7时半时半4时时12时时圆柱圆柱正方体正方体长方体长方体球球上上1012 13 14 1517 18 1914 162013 15 17 19777926511813141710111515141212151441012412101791013157411+9875+1215-2133+2+51010-3-43131415141516151617161718+6-6131232452826上上左左下下Where there is a will,there is a way.有志者,事竟成