см вниз
Пошаговое объяснение:
9.1 -4x = 28
-x = 7
x = -7
9.2 0.7x = - 4.2
x = -6
9.3 -1.4x = -5.6
-x = -4
x = 4
9.4 1/3x = 2/9
x = 2/9 * 3
x = 6/9
9.5 4/7 x = 1
x = 1 * 7/4
x = 7/4 = 1.75
9.6 3x = 7
x = 3/7
9.7 3/4x = - 12
x = - 16
9.8
-7/3 x = 7/15
x = 3 / 15
9.9 18x = 9
x =1/2
10.1
2x = 18 - x
3x = 18
x = 6
10 .2
7x + 3 = 30 - 2x
9x = 27
x = 9
10.3
7 -x = 3x -18
25 = 5x
x = 5
10.4
0.2x + 2.7 = 1.4 - 1.1 x
1.3x = 1.4 - 2.7
1.3x = - 1.3
x = -1
10.5
5.4 - 1.5x = 0.3x - 3.6
5.4 + 3.6 = 1.8x
9 = 1.8 x
10.6
3/6x + 15 = 1/6 x + 10
10 = 1.8x
x = 5 и 5/9
11.1
3(x-2) = x + 2
3x - 6 = x + 2
4x = 8
x =2
11.2
5 - 2(X-1) = 4 -X
5 -(2x - 2) = 4 - x
5 - 2x + 2 = 4 -x
5 + 2 = 4 + x
7 - 4 = x
x =3
11.3
(7x + 1)-(9x + 3) = 5
7x + 1 -9x - 3 = 5
-2x -2 = 5
-2x = 7
x = -3.5
11.4
3.4 + 2y = 7*(y - 2.3)
3.4 = 7y - 16.1 - 2y
19.5 = 5x
x = 3.9
11.5
0.2 (7 - 2y) = 2.3 - 0.3(y-6)
1.4 - 0.4 y = 2.3 - ( 0.3y - 1.8)
1.4 - 0.4 y = 2.3 -0.3 y + 1.8
1.4 = 2.3 + 1.8 + 0.1x
1.4 - 2.3 - 1.8 = 0.1x
-2.7 = 0.1 x
x = -27
11.6
2/3 (1/3 x - 1/2 x) = 4x + 2 1/2
2/9 x - 2/6 = 4x + 2 1/2
4/18x - 6/18 = 72/18x + 45/18
- 51/18 = 68/18x
x = -51/18
(650000: 3125-196,5)* 3,14=36,11
1)650000 : 3125
6250 208
25000
0
2) 208,0
- 196,5
11,5
3) 11,5
* 3,14
460
115
345
36,11
см вниз
Пошаговое объяснение:
9.1 -4x = 28
-x = 7
x = -7
9.2 0.7x = - 4.2
x = -6
9.3 -1.4x = -5.6
-x = -4
x = 4
9.4 1/3x = 2/9
x = 2/9 * 3
x = 6/9
9.5 4/7 x = 1
x = 1 * 7/4
x = 7/4 = 1.75
9.6 3x = 7
x = 3/7
9.7 3/4x = - 12
x = - 16
9.8
-7/3 x = 7/15
x = 3 / 15
9.9 18x = 9
x =1/2
10.1
2x = 18 - x
3x = 18
x = 6
10 .2
7x + 3 = 30 - 2x
9x = 27
x = 9
10.3
7 -x = 3x -18
25 = 5x
x = 5
10.4
0.2x + 2.7 = 1.4 - 1.1 x
1.3x = 1.4 - 2.7
1.3x = - 1.3
x = -1
10.5
5.4 - 1.5x = 0.3x - 3.6
5.4 + 3.6 = 1.8x
9 = 1.8 x
x = 5
10.6
3/6x + 15 = 1/6 x + 10
10 = 1.8x
x = 5 и 5/9
11.1
3(x-2) = x + 2
3x - 6 = x + 2
4x = 8
x =2
11.2
5 - 2(X-1) = 4 -X
5 -(2x - 2) = 4 - x
5 - 2x + 2 = 4 -x
5 + 2 = 4 + x
7 - 4 = x
x =3
11.3
(7x + 1)-(9x + 3) = 5
7x + 1 -9x - 3 = 5
-2x -2 = 5
-2x = 7
x = -3.5
11.4
3.4 + 2y = 7*(y - 2.3)
3.4 = 7y - 16.1 - 2y
19.5 = 5x
x = 3.9
11.5
0.2 (7 - 2y) = 2.3 - 0.3(y-6)
1.4 - 0.4 y = 2.3 - ( 0.3y - 1.8)
1.4 - 0.4 y = 2.3 -0.3 y + 1.8
1.4 = 2.3 + 1.8 + 0.1x
1.4 - 2.3 - 1.8 = 0.1x
-2.7 = 0.1 x
x = -27
11.6
2/3 (1/3 x - 1/2 x) = 4x + 2 1/2
2/9 x - 2/6 = 4x + 2 1/2
4/18x - 6/18 = 72/18x + 45/18
- 51/18 = 68/18x
x = -51/18
(650000: 3125-196,5)* 3,14=36,11
1)650000 : 3125
6250 208
25000
25000
0
2) 208,0
- 196,5
11,5
3) 11,5
* 3,14
460
115
345
36,11