Помогите решить даю 25 баллов
Ответы
Ответ:
а) 8х + 12 = 3х + 27
8х-3х = 27-12
5х = 15
х = 15:5
х = 3
8*3+12 = 3*3+27
36 = 36
б) 7х - 4 = 5х + 8
7х-5х = 8+4
2х = 12
х = 12:2
х = 6
7*6-4 = 5*6+8
38 = 38
в) 2х - 8 = х - 4
2х-х = 8-4
х = 4
2*4-8 = 4-4
0 = 0
1.
25/100 = 1/4 = 15/60
9/30 = 3/10 = 18/60
2.
а) 5/7 и 1/2
10/14 и 7/14
б) 7/20 и 1/15
21/60 и 4/60
в) 3/26 и 5/39
18/156 и 20/156
г) 8/11 и 5/8
64/88 и 55/88
д) 7/13 и 2/11
77/143 и 26/143
е) 3/22 и 2/33
9/66 и 4/66
Пошаговое объяснение:
1.
25/100 = 25:25/100:25 = 1/4 = 1*15/4*15 = 15/60
9/30 = 9:3/30:3 = 3/10 = 3*6/10*6 = 18/60
2.
а) 5/7 и 1/2
НОК(7;2) = 7*2 = 14
10/14 и 7/14
б) 7/20 и 1/15
НОК(20;15) = 2*2*5*3 = 60
21/60 и 4/60
в) 3/26 и 5/39
НОК(26;39) = 2*13*3 = 78
9/78 и 10/78
г) 8/11 и 5/8
НОК(11;8) = 11*8 = 88
64/88 и 55/88
д) 7/13 и 2/11
НОК(13;11) = 13*11 = 143
77/143 и 26/143
е) 3/22 и 2/33
НОК(22;33) = 2*11*3 = 66
9/66 и 4/66