787 + 198 = 985 192 + 306 =498 860 + 350 =1210 486 -69=417 756 +143 =899 598 -101=497
1) (324 : 9) х 4 = 36 Х 4 = 144
2) (324 : 6) х 1 = 54 Х 1 = 54
3) 324 - (144 + 54) = 324 - 198 = 126
Ответ : 126
Если a=10 11/13, b= 1/2, c= 3 1/2, то 28/76*(10 11/13-2 11/13:1/2):3 1/2
1) 37/13:1/2=74/13
2)141/13-74/13=67/13
3)28/67*67/13= 28/13
Вроде так
DE=2/5-1/10=4/10-1/40=3/10 м
СЕ=19/20-2/5-3/10=19/20-8/20-6/20=5/20=1/4м