小学4年级数学下册104页第2题
2.计算下面各题,怎样简便就怎样计算
1.88+2.3+3.7 5.17-1.8-3.2
=1.88+(2.3+3.7) = 5.17-(1.8+3.2)
=1.88+6 =5.17-5
=7.88 = 0.17
4.02-3.5+0.98 13.7+0.98+0.02+4.3
=4.02+0.98-3.5 =(13.7+4.3)+(0.98+0.02)
=5-3.5 = 18+1
=1.5 =19
105页第3题
3.计算下面各题,怎样简便就怎样计算
5.6+2.7+4.4 9.14-1.43-4.57
=5.6+4.4+2.7 = 9.14-(1.43+4.57)
=10+2.7 = 9.14-6
=12.7 = 3.14
9.5+4.85-6.13 77+2.7+2.3+25
=14.35-6.13 =(77+25)+(2.3+2.7)
=8.22 = 102+5
=107
10.75+0.4-9.86 51.27-8.66-1.34
=11.15-9.86 =51.27-(8.66+1.34)
=1.29 =51.27-10
=41.27
我有四年级下册人教版数学书
非官方
你把题目打出来