Автор - NastyaLove2007
Ответ:
Пошаговое объяснение:
1. (7-2 2/5 * 1 7/8) : 5 5/8=49
2 25*1 78=125*158=92=4.5
7-4.5=2.5
2.5:5 58=52*845=49
2. (3 1/3 - 1 7/8) * 24 + 31 1/2 : 3=45.5
3 1/3 - 1 7/8=3 824-1 2124=1 1124
1 1124*24=3524*24=35
31 1/2 : 3=632*13=212=10 12
35+10 12=45 12
Пошаговое объяснение:
(7-2 2/5 * 1 7/8) : 5 5/8=4/9
1)2 2/5 * 1 7/8 = 12/5 * 15/8 = (12*15)/(5*8) = 9/2
2)7- 9/2 = 7/1 - 9/2 = (14-9)/2=5/2
3)5/2 : 5 5/8 = 5/2 * 8/45 = (5*8)/(2*45) = 4/9
(3 1/3 - 1 7/8) * 24 + 31 1/2 /3=45 1/2
1) 3 1/3 - 1 7/8 = 10/3 - 15/8 = (80-45)/24 = 35/24
2) 35/24 * 24 = 35/24*24/1 = (35*24)/(24*1)=35
3)31 1/2 : 3 = 63/2 : 3/1 = 63/2 * 1/3 = (63*1)/(2*3)=21/2
4)35 + 21/2 = 35/1 + 21/2 = (70 + 21)/(2)=91/2 = 45 1/2