Question

4•(0,8х-0,25у)-0,7•(2х-3у)= Если х=0,25 у=-0,6

Answer 1

3,2x-y-1,4x+2,1y= 1,8x+1,1y
1,8*0,25-1,1*0,6= 0,45-0,66= -0,21

Answer 2

To find the value of the expression 4•(0.8х - 0.25у) - 0.7•(2х - 3у) when х = 0.25 and у = -0.6, we'll substitute these values into the expression and then simplify it step by step.

Let's first replace х with 0.25 and у with -0.6:

4 • (0.8 • 0.25 - 0.25 • (-0.6)) - 0.7 • (2 • 0.25 - 3 • (-0.6))

Now, perform the operations inside the parentheses:

4 • (0.2 + 0.15) - 0.7 • (0.5 + 1.8)

Next, calculate the values inside the parentheses:

4 • 0.35 - 0.7 • 2.3

Now perform the multiplications:

1.4 - 1.61

Finally, subtract:

-0.21

So, the value of the expression 4•(0.8х - 0.25у) - 0.7•(2х - 3у) when х = 0.25 and у = -0.6 is -0.21.