(4.71-8.9) + (8.9-4.71)=4.71-8.9 + 8.9-4.71=0<span>
(6 13/18-4.2)-(2 7/18 -1.2)=</span>6 13/18-4.2-2 7/18 +1.2=4 6/18-3=1 6/18=1 1/3<span>
(5.9+3.1)-(5.9-3.1)=</span>5.9+3.1-5.9+3.1=6.2<span>
-8 11/13-(2/3-11/13)=</span>-8 11/13-2/3+11/13=-8 -2/3=-8 2/3
- 2 3/8 + 1/3 - 1 4/9 - 5/9 + 2/3 - 3 5/8 =
= (1/3 + 2/3) - (2 3/8 + 3 5/8) - (1 4/9 + 5/9) =
= 3/3 - 5 8/8 - 1 9/9 = 1 - 6 - 2 = - 7.
Ответ: (-7).
247230:41=6030
41×6030=247230
S1 = 11*8=80
S2=5*5=25
Sоставшееся части = 80-25=55(не уверена но думаю что так)