人教版小学数学一年级下册《练习二十》ppt课件.pptx
练习二十,2,2,1,3,4,3,6,7,15,18,21,+3,+3,2,-2,3,-2,1,5,+5,30,+5,35,4,4,-4,4,-4,0,80,10,17,+4,+4,+4,+4,-10,-10,-10,-10,2,9,6,6,7,5,8,4,1颗蓝珠子2颗红珠子,5,3,5,3,5,3,5,6,7,8,4,2,19,23,12,6,0,80,30,12,15,6,6,6,18,0,0,6,6,6,0,20,44,63,58,68,35,57,