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一年级数学下册,两位数减整十数,口算:,70-40=20+8=34+20=54 50+21=7160-30=30 40+5=45 34+2=36 5+21=26,30,28,45-30=,15,45-30=,42,45-30=15,45-3=42,4,3,1,5,3,2,想想做做 1.填出结果。54-20=86-50=54-2=86-5=,34,52,36,81,5,2,3,8,5,3,4,2,2,6,5,1,想想做做 2.60-30+8=9-6+70=68-30=79-6=,38,38,73,73,已经运走了40箱,还剩多少箱没有运走?,65-40=25(),箱,比比谁的眼力好!34+3=64 34-3=4 54-40=14 55-4=11,34+3=37,34-3=31,55-4=51,它们该坐哪个车厢,连一连。,43-20,67-5,56-40,89-4,56-3,53,83-20,72-60,59-8,37-5,64-40,63,12,24,51,32,找新家:,94-60=76-50=47-3=37-6=77-7=49-4=66-20=63-50=94-30=49-7=57-40=88-5=,34,31,46,42,26,70,13,17,44,45,64,83,