单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,练习十五,练习十五,1,39,45,31,28,75,72,76,91,94,97,36,78,88,87,75,76,394531287572769194973678888775,20+23=43,（个）,答：一共有,43,个学生。,20+23=43（个）,56+9=65,（节）,答：回收箱里现在有,65,节旧电池。,56+9=65（节）,13,33,14,44,10,60,17,87,23+8=31,67+2=69,5+47=52,133314441060178723+8=31 67+2=6,25+8=33,（只）,答：鸭和鹅一共有,33,只。,25+8=33（只）,20,83,31,85,52,88,81,99,80,81,54,55,41,42,71,208331855288819980815455414271,一年级数学下册教材习题解答15,26,31,83,37,42,94,263183374294,18,24,30,36,42,48,24,32,40,48,56,64,182430364248243240485664,35+7=42,（只）,答：一共有,42,只蚂蚁。,35+7=42（只）,59,37,80,90,70,92,593780907092,小军：,30+15+10=55,（分）,小红：,25+20+5=50,（分）,小军的得分多,小军：30+15+10=55（分）小红：25+20+5=50,多,6,枚,多6枚,