Question

Помогите плзвот примеры _20.8 : (12-11.36)-8:12.5 --если можно по действиями уровнение 21.71+4.06y=27.8

Answer 1

1)12-11,36=0,64

2)20,8:0,64=32.5

3)8:12.5=0,64

4)32,5-0,64=31,86

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21,71+4,06у=27,8

4,06у=27,8-21,71

4,06у=6,09

у=6,09:4,06

у=1.5

Answer 2

Solving Mathematical Equations

Let's start by solving the mathematical expression 20.8 - (12-11.36) - 8 ÷ 12.5 step by step.

First, we'll simplify the expression inside the parentheses: - 12 - 11.36 = 0.64

Now, we'll substitute this value back into the original expression: - 20.8 - 0.64 - 8 ÷ 12.5

Next, we'll perform the division: - 8 ÷ 12.5 = 0.64

Now, we'll substitute this value back into the expression: - 20.8 - 0.64 - 0.64

Finally, we'll perform the subtraction: - 20.8 - 0.64 - 0.64 = 19.52

So, the result of the expression 20.8 - (12-11.36) - 8 ÷ 12.5 is 19.52.

Moving on to the equation 21.71 + 4.06y = 27.8, we'll solve for y.

First, we'll isolate the term with y by subtracting 21.71 from both sides: - 4.06y = 27.8 - 21.71 - 4.06y = 6.09

Next, we'll solve for y by dividing both sides by 4.06: - y = 6.09 ÷ 4.06 - y ≈ 1.5

So, the value of y in the equation 21.71 + 4.06y = 27.8 is approximately 1.5.