Пошаговое объяснение:
1. (7-2 2/5 * 1 7/8) : 5 5/8=4\9
2 2\5*1 7\8=12\5*15\8=9\2=4.5
7-4.5=2.5
2.5:5 5\8=5\2*8\45=4\9
2. (3 1/3 - 1 7/8) * 24 + 31 1/2 : 3=45.5
3 1/3 - 1 7/8=3 8\24-1 21\24=1 11\24
1 11\24*24=35\24*24=35
31 1/2 : 3=63\2*1\3=21\2=10 1\2
35+10 1\2=45 1\2
(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
Пошаговое объяснение:
1. (7-2 2/5 * 1 7/8) : 5 5/8=4\9
2 2\5*1 7\8=12\5*15\8=9\2=4.5
7-4.5=2.5
2.5:5 5\8=5\2*8\45=4\9
2. (3 1/3 - 1 7/8) * 24 + 31 1/2 : 3=45.5
3 1/3 - 1 7/8=3 8\24-1 21\24=1 11\24
1 11\24*24=35\24*24=35
31 1/2 : 3=63\2*1\3=21\2=10 1\2
35+10 1\2=45 1\2
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