4/10х- 40 ..................................
8•8•8=24. 24:3=8. 3 множителя, равных 8.
1/30 + 2/5 + 7/30 + 1/3 =
= 1/30 + 2*6/30 + 7/30 + 1*10/30 =
= 1/30 + 12/30 + 7/30 + 10/30 =
= 30/30 = 1
5/8 + 5/12 - 13/24 =
5*3/24 + 5*2/24 - 13/24 =
15/24 + 10/24 - 13/24 =
12/24 = 1/12,
5/16 + (7/16 + 1/4) =
= 5/16 + (7/16 + 1*4/16) =
= 5/16 + 7/16 + 4/16 =
= 16/16 = 1
7+5=12всего деревьев. 354*7=2478 яблонь. 354*5=1770 груш