0,5а*20b=10ab 10*4*6.8=4*68=272 4m*0.5n=2mn 2*22*100=22*200=4400 0.25x*0.4y=0.1xy 0.1*1.2*0.3=0.036 0.8k*12.5c=10kc 10*0.58*0.1=0.58