Question

Решите уравнение:
1.
а) 3х=15 в) 3х+х+2=18
б) 4х-2=14 г) 3х-12=х
2.
а) 4х-2=2х+6 в)2х+6=4х-2
б) 2х-2=6+4х г) -4х-4=2х+8
8,154/2,7-19,296/3,2-38,872/4,3

Answer 1

1.
а) 3х=15
x = 15/3
x = 5

в) 3х+х+2=18
4x = 18 - 2
4x = 16
x = 16/4
x = 4

б) 4х-2=14
4x = 14 - 2
4x = 12
x = 12/4
x = 3

г) 3х-12=х
3x - x = 12
2x = 12
x = 12/2
x = 6

2.
а) 4х-2=2х+6
4x - 2x = 6 + 2
2x = 8
x = 8/2
x = 4

в)2х+6=4х-2
2x - 4x = -2 - 6
-2x = -8
x = -8/-2
x = 4

б) 2х-2=6+4х
2x - 4x = 6 + 2
-2x = 8
x = -8/2
x = -4

г) -4х-4=2х+8
-4x - 2x = 8 + 4
-6x = 12
x = -12/6
x = -2

8,154/2,7-19,296/3,2-38,872/4,3
3.02 - 6.03 - 9.04 = -12.05

Answer 2

1.
а) 3х = 15;
х = 15:3;
х = 5;

б) 4х - 2 = 14;
4х = 14 + 2;
4х = 16;
х = 16 : 4;
х = 4;

в) 3х + х + 2 = 18;
4х + 2 = 18;
4х = 18 - 2;
4х = 16;
х = 16 : 4;
х = 4;

г) 3х - 12 = х;
3х - х = 12;
2х = 12;
х = 12 : 2;
х = 6.

2. а) 4х - 2 = 2х + 6;
4х - 2х = 6 + 2;
2х = 8;
х = 8 : 2;
х = 4;

б) 2х - 2 = 6 + 4х;
2х - 4х = 6 + 2;
-2х = 8;
х = 8 : (-2);
х = -4;

в) 2х + 6 = 4х - 2;
2х - 4х = -2 - 6;
-2х = -8;
х = -8 : (-2);
х = 4;

г) -4х - 4 = 2х + 8;
-4х - 2х = 8 + 4;
-6х = 12;
х = 12 : (-6);
х = -2.

8,154 / 2,7 - 19,296 / 3,2 - 38,872 / 4,3 =
1) 8,154 / 2,7 = 3,02;
2) 19,296 / 3,2 = 6,03;
3) 38,872 / 4,3 = 9,04;
4) 3,02 - 6,03 = -3,01;
5) -3,01 - 9,04 = -12,05.