248
k = 11,4:(-5,7)
k= - 2
n= -2:0,001
n= - 2000
0,4-x = 9:3
0,4-x=3
-х=3-0,4
-х=2,6
х = - 2,6
x-7=0,8:0,2
x-7=4
х=4+7
х=11
z= - 2 9/13:7/26
z= - 35/13*26/7
z = -10
-7/15x = 1 2/3+3
- 7/15x = 4 2/3
х = 4 2/3:(-7/15)
х = 14/3*(-15/7)
х = - 10
251(б)
17/21z+9/14=5/21
17/21z = 5/21-9/14
17/21z = 10/42-27/42
17/21z = - 17/42
z = -17/42:17/21
z = -17/42*21/17
z = - 2
249
а) -8,06:2,6 = - 3,1
-3,1 -0,7 = -3,8
-3,8:(-0,19) = 20
20*(-0,01) = -0,2
Ответ: - 0,2
б) 6 3/7*3 1/3 = 45/7*10/3 = 150/7
150/7:(-1 2/7) = 150/7*(-7/10) = -15
Отвте: - 15
в) 5 4/5-7 2/3 = 5 12/15 - 7 10/15 = -2 2/15
-2 2/15:(-2 4/5) = 32/15:14/5 = 32/15*5/14 = 16/21
Ответ: 16/21