помогите номер 2.3.4.

№2

а) (4*3-1*5)/(5*3) = (12-5)/15 = 7/15

б) (3*3-1*4)/(4*3) = (9-4)/12 = 5/12

в) (4*4-3*5)/(5*4) = (16-15)/*20 = 1/20

г) (3*9-4*4)/(4*9) = (27-16)/36 = 11/36

№3

а) (9-2*2)/14 = (9-4)/14 = 5/14

б) (5-1*4)/12 = (5-4)/12 = 1/12

в) (7-2*2)/10 = (7-4)/10 = 3/10 = 0,3

г) (17-1*10)/100 = (17-10)/100 = 7/100 = 0,07