15/22-(4-1 5/6) : х=1 5/33
(4-1 5/6) : х=1 5/33 - 15/22
(4-1 5/6) : х=1 10/66 - 45/66=31/66
2 1/6 : х=31/66
х=2 1/6 : 31/66=13/6*66/31
х=143/31=4 19/31
.
- 3 9/25 * 1 17/63+1 19/45*1 3/32=6/25
1) -3 9/25 * 1 17/63= - 84/25*80/63= - 64/25= - 2 14/25
2) 1 19/45 * 1 3/32=64/45 * 35/32=14/5=2 4/5
3) - 2 14/25+2 4/5= - 2 14/25 + 2 20/25=6/25