дроби №18 а)3/4-1/6; б) 5/6+4/9; в) 4/45 -1/30; г)17/18-11/12. №23 А) 10:3; б) 42:8 ; в) 57:30; г) 28:42 .
3/4 - 1/6 = 9/12-2/12= 7/12
5/6 + 4/9= 15/18 + 8/18 = 23/18 = 1 5/18
4/45-1/30 8/90-3/90= 5/90 = 1/18
17/18 -11/12= 34/36-33/36= 1/36
10:3 = 3 1/3
42:8= 5 2/8 или 5 1/4
57:30= 1 27/30 или 1,9
28:42 - 2/3
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Answers & Comments
3/4 - 1/6 = 9/12-2/12= 7/12
5/6 + 4/9= 15/18 + 8/18 = 23/18 = 1 5/18
4/45-1/30 8/90-3/90= 5/90 = 1/18
17/18 -11/12= 34/36-33/36= 1/36
10:3 = 3 1/3
42:8= 5 2/8 или 5 1/4
57:30= 1 27/30 или 1,9
28:42 - 2/3