Ответы и объяснения

2013-02-18T17:50:53+00:00
2013-02-18T17:58:19+00:00

15*(1/2)*2-9*(2/3)*2=3 

1) 15*2*(1/2)=30*(1/2)=30/1*1/2=15

2) 9*2*(2/3)=18*(2/3)=18/1*2/3=12

3) 15-12=3