91/18-4 5/6; 3,6-1,8+6,4; -3 5/7+3,5-1 2/7; 0-3-1/3; - вопрос №493532491184563618643573512703130522427512261 от Босс05 10.04.2023 13:04

Question

Математика: 91/18-4 5/6; 3,6-1,8+6,4; -3 5/7+3,5-1 2/7; 0-3-1/3; 0,5+2 2/4-2,75+1/2; -2,6+1 1/3+8 2/3; -2,3+2,5-11,2; -4,2+11 1/7; 8,9-7,8+6,7-9,7. !

Босс05 · Answer

- 9 1/18 - 4 5/6 = -163/18 - 29/6 = -(163+87)/18 = -250/18 = -13 16/18 = -13 8/9
3,6 - 1,8 + 6,4 = 1,8 + 6,4 = 8,2
-3 5/7 + 3,5 - 1 2/7 = - 26/7 + 35/10 - 9/7 = (-260+245-90)/70 = -105/70 = -1 35/70 = -1 1/2 = -1,5
0 - 3 - 1/3 = - 3 - 1/3 = - 3 1/3
0,5 + 2 2/4 - 2,75 + 1/2 = 5/10 + 10/4 - 275/10 + 1/2 = (20+100)/40 - 275/10 + 1/2 = 120/40 - 275/10 + 1/2 = (120-1100)/40 + 1/2 = -980/40 + 1/2 = (-980+20)/40 = -960/40 = -24
-2,6 + 1 1/3 + 8 2/3 = -26/10 + 4/3 + 26/3 = (-78+40+260)/30 = 222/30 = 7 12/30 = 7 2/5
-2,3 + 2,5 - 11,2 = 0,2 - 11,2 = -11
-4,2 + 11 1/7 = -42/10 + 78/7 = (-294+780)/70 = 486/70 = 6 66/70 = 6 33/35
8,9 - 7,8 + 6,7 - 9,7 = 1,1 + 6,7 - 9,7 = 7,8 - 9,7 = - 1,9