7,8* 4/13-61,5:13 2/3+198,8=196,7
1) 7,8 * 4/13=7,8* 4:13=2,4
2) 61,5:13 2/3=61,5:41/3=61,5 * 3:41=4,5
3) f - 4, 5 = - 2, 1
4) - 2, 1 + 198, 8 = 198, 8 - 2, 1 = 196, 7
