9) 10) 19) 20)тоже помогите пожалуйста мне !!!
![](https://st.uroker.com/files/584/584950f3079469b50238b162bcfca21a.jpg)
Ответы
9) 9|x|-6=0
9•|x|=6
|x|=2/3
x=-2/3
x1= -2/3, x2= 2/3
10) 8/x=6/5
8/x=6/5, x≠0
40=6x
6x=40
x= 20/3, x≠0
x= 20/3= 6⅔= 6,6
19) 2m/3 - 4m/5 = 3
10m - 12m = 45
-2m = 45
m= 45/2 = -22½ = -22,5
20) 4a/9 - 1 = 5a/12
16a - 36 = 15a
16a - 15a = 36
a = 36
21) 3(1-x)+5(x+2)=1-4x
3-3x+5x+10=1-4x
13+2x=1-4x
2x+4x=1-13
6x= -12
x= -2
22) 3(2-x)-(5x+4)=0,4-16x
6-3x-5x-4=0,4-16x
2-8x=0,4-16x
-8x+16x=0,4-2
8x= -16
x= -0,2
23) 2 (3-5p)=4 (1-p)-1
6-10p=5-4p-1
6-10p=3-4p
-10p+4p=3-6
-6p= -3
p= 1/2
24) 0,5 (2y-1)-(0,5-0,2y)+1=0
y-0,5-0,5+0,2y+1=0
1,2y+0=0
1,2y=0
y=0
25) -4 (5-2m)+3 (m-4)=6 (2-m)-5m
-20+8m+3m-12=12-6m-5m
-32+11m=12-11m
11m+11m=12+32
22m=44
m=2
26) 0,3 (3x-1)+0,2=5 (0,1-0,2x)-0,1
0,9x-0,3+0,2=0,5-x-0,1
0,9x-0,1=0,4-x
0,9+x=0,4+0,1
1,9x=0,5
x= 5/19
Ответ:
9) 9[x]-6=0
9[x]=6
[x]=2/3
x=2/3, x=-2/3
10) 8/x=6/5
6x=40
x=40/6
x=20/3
x=6 2/3
19) 2m/3 - 4m/5 =3
10m-12m=45
-2m=45
m=-45/2
m= -22,5
20) 4a/9 - 1 = 5a/12
16a - 36 = 15a
16a - 15a = 36
a=36
21) 3-3x+5x+10=1-4x
13+2x=1-4x
2x+4x=1-13
6x=-12
x=-2
22) 6-3x-5x-4=0.4-16x
2-8x=0.4-16x
16x-8x=0.4-2
8x=-1.6
x= -0.2
23) 6-10p=4-4p-1
6-10p=3-4p
-10p+4p=3-6
-6p=-3
p=0.5
24) y-0.5-0.5+0.2y+1=0
1.2y+0=0
1.2y=0
y=0
25) -20+8m+3m-12=12-6m-5m
-32m+11m=12-11m
11m+11m=12+32
22m=44
m=2
26) 0.9x-0.3+0.2=0.5-x-0.1
0.9x-0.1 = 0.4-x
0.9x+x=0.4+0.1
1.9x=0.5
x= 5/19