2 4/13 · (3/8 - 4/15) - 11 : 5 1/2 = -1 3/4
1) 3/8 - 4/15 = 45/120 - 32/120 = 13/120
2) 2 4/13 · 13/120 = 30/13 · 13/120 = 30/120 = 1/4
3) 11 : 5 1/2 = 11 : 11/2 = 11 · 2/11 = 2
4) 1/4 - 2 = -1 3/4
ответ: -1 целая 3/4 (-1,75 в десятичных дробях).
2 4/13 · (3/8 - 4/15) - 11 : 5 1/2 = -1 3/4
1) 3/8 - 4/15 = 45/120 - 32/120 = 13/120
2) 2 4/13 · 13/120 = 30/13 · 13/120 = 30/120 = 1/4
3) 11 : 5 1/2 = 11 : 11/2 = 11 · 2/11 = 2
4) 1/4 - 2 = -1 3/4
ответ: -1 целая 3/4 (-1,75 в десятичных дробях).