5.1x+184.11=245.82
5.1x=61.71
x=12.1
1)1/2+5/7=(7+10)/14=17/14
2) 1/2-1,3=(3-2)/6=1/6
3) 2/3-4/9=(6-4)/9=2/9
По графику решения:
(3; 5); (10; 1,5)
8 : 4 = 2
1 : 3 = 1/3
5 : 8 = 5/8
7 : 10 = 7/10
15 : 3 = 5
16 : 3 = 16/3 или 5 1/3
126 : 10 = 126/10 или 12 6/10
100 : 7 = 100/7 или 14 2/7
24/17*51/40=1 4/5=9/5
18/39*13/36= 1/6
18/95*35/3*19/42=1
20/23*73/48*46/73=5/6