用列举的策略解决问题练习
1: 6.28-(1.28+2.18) 0.94+0.46+9.54
= 6.28-1.28-2.18 =0.94+(0.46+9.54)
= 5-2.18 = 0.94+10
= 2.82 = 10.94
25×1.6×1.25 0.56×9.9+056×0.1
=(25×2)×(0.8×1.25) = 0.56×(9.9+0.1)
= 50×1 = 0.56×10
= 50 = 5.6
2: 1+19 3+17 5+15 7+13 9+11
一共有5种不同的分法
3: 1.41 1.42 1.43 1.44 1.45
1.46 1.47 1.48 1.49
共9个