1. -4
2. 14.6
3. 11
4. 20
5. 70
6. -12
Пошаговое объяснение:
1) 8.1 - (3.1 -y) = 1
8.1 - 3.1 + y = 1
y = -4
2) 9.4 + (8.6 - x) = 0.4
9.4 + 8.6 - x = 0.4
-x = -14.6
x = 14.6
3) 0.6(x + 7) - 0.5(x - 3) = 6.8
0.6x + 4.2 - 0.5x + 1.5 = 6.8
0.1x = 1.1
x = 11
4) 0.3(x-2)-0.2(x+4) = 0.6
0.3x - 0.6 - 0.2x - 0.8 = 0.6
0.1x = 2
x = 20
5) -7(0.3x - 8) + 3(0.4x + 5) = 8
-2.1x + 56 + 1.2x + 15 = 8
-0.9x = -63
x = 70
6) 0.87x - 0.9x + 1.3x = -15,24
1.27x = -15.24
x = -12
1. -4
2. 14.6
3. 11
4. 20
5. 70
6. -12
Пошаговое объяснение:
1) 8.1 - (3.1 -y) = 1
8.1 - 3.1 + y = 1
y = -4
2) 9.4 + (8.6 - x) = 0.4
9.4 + 8.6 - x = 0.4
-x = -14.6
x = 14.6
3) 0.6(x + 7) - 0.5(x - 3) = 6.8
0.6x + 4.2 - 0.5x + 1.5 = 6.8
0.1x = 1.1
x = 11
4) 0.3(x-2)-0.2(x+4) = 0.6
0.3x - 0.6 - 0.2x - 0.8 = 0.6
0.1x = 2
x = 20
5) -7(0.3x - 8) + 3(0.4x + 5) = 8
-2.1x + 56 + 1.2x + 15 = 8
-0.9x = -63
x = 70
6) 0.87x - 0.9x + 1.3x = -15,24
1.27x = -15.24
x = -12
-(3,1 - у) = 1 - 8,1
-3,1 + у = -7,1
у = -7,1 + 3,1
у = -4
2) 9,4 + (8,6 - x) = 0,4
8,6 - х = 0,4 - 9,4
8,6 - х = -9
-х = -9 - 8,6
-х = -17,6
х = 17,6
3) 0,6(x + 7) - 0,5(x - 3) = 6,8
0,6х + 4,2 - 0,5х + 1,5 = 6,8
0,6х - 0,5х = 6,8 - 4,2 - 1,5
0,1х = 1,1
х = 1,1 : 0,1
х = 11
4) 0,3(x - 2) - 0,2(x + 4) = 0,6
0,3х - 0,6 - 0,2х - 0,8 = 0,6
0,1х - 1,4 = 0,6
0,1х = 0,6 + 1,4
0,1х = 2
х = 2 : 0,1
х = 20
5) -7(0,3x -8) + 3(0,4x + 5) = 8
-2,1х + 56 + 1,2х + 15 = 8
-0,9х + 71 = 8
-0,9х = 8 - 71
-0,9х = -63
х = -63 : (-0,9)
х = 70
6) 0,87x - 0,9x + 1,3x = -15,24
0,87х + 1,3х - 0,9х = -15,24
2,17х - 0,9х = -15,24
1,27х = - 15,24
х = -15,24 : 1,27
х = 12