8.5*0.739十0.15*7.39 要求简便计算,怎样算?

8.5*7.39/10+0.15*7.39=7.39*（0.85+0.15）=7.39

8.5*0.739十0.15*7.39
=0.85*7.39+0.15*7.39
=（0.85+0.15）*7.39
=7.39

8.5 X 0.739 + 0.15 X 7.39
= 0.85 X 7.39 + 7.39 X 0.15
= 7.39 X ( 0.85 + 0.15 )
= 7.39 X 1
= 7.39