Question

Решите пожалуйста уравнения!!1)2y+3,9+7y=31,8 И ещё 2)3,2х-1,8х-0,54=0,3

Answer 1

1)2y+3,9+7y=31,8
2y+7y=31,8-3,9
9y=27,9
y=27,9:9
y=3,1

2)3,2х-1,8х-0,54=0,3
3,2х-1,8х=0,3+0,54
1,4х=0,84
х=0,84:1,4
х=0,6

Answer 2

Ответ:

2у+3,9+7у=31,8

9у+3,9=31,8

9у=31,8-3,9

9у=27,9

у=27,9:9

у=3,1

3,2х-1,8х-0,54=0,3

1,4х-0,54=0,3

1,4х= 0,3+0,54

1,4х=0,84

х=0,84:0,4

х=0,6

Answer 3

2y + 3.9 + 7y = 31.8

Combining like terms on the left-hand side:

9y + 3.9 = 31.8

Subtracting 3.9 from both sides:

9y = 27.9

Dividing both sides by 9:

y = 3.1

Therefore, the solution to the equation is y = 3.1.

3.2x - 1.8x - 0.54 = 0.3

Combining like terms on the left-hand side:

1.4x - 0.54 = 0.3

Adding 0.54 to both sides:

1.4x = 0.84

Dividing both sides by 1.4:

x = 0.6

Therefore, the solution to the equation is x = 0.6.