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в 1 кг - 1000г, 1000/5 = 200. 12х200 = 2400 желудей.
1)3 2/7+5 5/7=23/7+40/7=63/7=9
2)9- 1 5/9=9/1-14/9=9*9/9=14-9=81/9-14-9=67/9=7 4/9
3)7 4/9-2 8/9=67/9-26/9=41/9=4 5/9
((65+33:11):2)+(5*4+2)):8