Răspuns:
Explicație pas cu pas:
6,58(3) = (6583 - 658)/900 = 5925/900
4,2(7) = (427 - 42)/90 = 385/90
0,61(36) = (6136 - 61)/9900 = 6075/9900
5925/900 - 385/90 - 6075/9900 = 5925/900 - 3850/900 - 6075/9900 =
= 2075/900 - 6075/9900 = 22825/9900 - 6075/9900 = 16750/9900 =
= 1675/990
1675 /990 : 19/36 = 1675/990 * 36/19 = 335*2/11*19 = 670/209
_________
10 - 670/209 = 2090/209 - 670/209 = 1420/209