65 - (22 + п) = 65 - 22 - п = 43 - п
При п = 30 → 43 - 30 = 13
5х+30+1=3-2х
5х+2х=3-30-1
7х=-28
х=-28/7
х=-4
1 ) 9х+5=50 (9х5+5=50)
2) 8х-4=36 (8х5-4=36)
3) 77-13х=12 (77- 13х5=12)
8 1/2 : m = 3 2/3 * 1 1/11
17/2 : m = 11/3 * 12/1
17/2 : m = 132/3
17/2 : m = 44
m = 17/2 : 44
m = 17/2 * 1/44
<u>m = 17/88</u>
<u>проверка:</u>
8 1/2 : 17/88 = 3 2/3 * 1 1/11
17/2 * 88/17 = 11/3 * 12/11
88/2 = 132/3
44 = 44