Ответы и объяснения

2013-11-17T15:29:12+00:00
4m 23sm*5= 5*23=115sm= 1m 12 sm
4*5=20m=20m+1m 15 sm=21m 15sm

12m 8dm * 7= 8*7=56dm= 5m 6 dm
12m*7=84m+5m 6dm=89m 6 dm

25km 3 sm*17=17*3sm=51sm
25km*17= 425km+51sm=425km 51sm