1) -2 1/2 : 31/2 = -2.5 / $3+1/2$ = -2.5 / $7/2$ = -2.5 * 2/7 = -5/7

2) -4 2/3 : $-11/6$ = -4.666... / $-\mathrm{1.833...}$ = 14/3

3) 3 3/8 $-21/4$ = 27/8 $-9/10$ = -243/80

4) -7 1/2 : 3 3/4 = -15/2 : 15/4 = -15/2 * 4/15 = -2

5) -5 4/9 : $-21/3$ = -49/9 : $-7/3$ = 49/9 * 3/7 = 7

6) 9 1/3 : $-62/9$ = 28/3 : $-56/9$ = -28

Уравнения:

1) -1.22x = 6.1
x = 6.1 / -1.22
x = -5

2) -8.9$-x$ = 11.57
8.9x = 11.57
x = 11.57 / 8.9
x = 1.3

3) 9.6$-y$ = -43.2
-y = -43.2 / 9.6
y = 43.2 / 9.6
y = 4.5

4) -5.3x = 2.65
x = 2.65 / -5.3
x = -0.5

5) 0.3$-x$ = -2.34
-x = -2.34 / 0.3
x = 2.34 / 0.3
x = 7.8

6) -6.1y = 19.52
y = 19.52 / -6.1
y = -3.2