Question

1,2+3/10у=8/15у+0,78

Answer 1

3/10 у - 8/15 у  = 0,78 - 1,2

-7/30 у = -0,42

у = -0,42 : -7/30

у = 1,8

Ответ: 1,8

Answer 2

3/10y-8/15y=0,78-1,2

-7/30y=-0,42

 

 y=9/5=1 4/5=1,8

Answer 3

It appears that you've written an equation that includes the variable "у" (which I assume is meant to represent the variable "y"). To solve for the value of "y" in the equation, you can follow these steps:

1. Start by simplifying both sides of the equation.

   The equation is: 1 + 2 + (3/10)y = (8/15)y + 0.78

   Combine like terms on each side: 3 + (3/10)y = (8/15)y + 0.78

2. To isolate the variable "y" on one side of the equation, you can move all the terms involving "y" to one side and constants to the other side.

   Subtract (8/15)y from both sides: 3 + (3/10)y - (8/15)y = 0.78

   To add fractions, you need a common denominator. In this case, the common denominator is 30, so:

   3(30/30) + (3/10)y - (2/15)y = 0.78

   Simplify the fractions: (90/30) + (3/10)y - (2/15)y = 0.78

3. Continue simplifying:

   (3)y - (2)y = 0.78 - (90/30)

   y - (2/15)y = 0.78 - 3

4. Combine like terms:

   (1 - 2/15)y = -2.22

5. Solve for "y" by dividing both sides by the coefficient of "y" (1 - 2/15):

   y = (-2.22) / (1 - 2/15)

6. Calculate the value of "y":

   y = (-2.22) / (15/15 - 2/15) y = (-2.22) / (13/15)

   To divide by a fraction, you can multiply by its reciprocal:

   y = (-2.22) * (15/13)

Now, calculate the value of "y":

y ≈ -2.5546

So, the solution to the equation is approximately:

y ≈ -2.5546