Question

-0,5(1-3n)+4(0,2n-0,1)-(0,1-0,7n) n=0,21

Answer 1

Ответ:

-0,37

Пошаговое объяснение:

=-0,5+1,5n+0.8n-0.4-0.1+0.7n=-1+3n=-1+3*0.21=-1+0.63=-0.37

Answer 2

To evaluate the expression -0.5(1-3n) + 4(0.2n-0.1) - (0.1-0.7n) for n = 0.21, you can substitute the value of n into the expression and simplify:

-0.5(1 - 3(0.21)) + 4(0.2(0.21) - 0.1) - (0.1 - 0.7(0.21))

Now, let's calculate it step by step:

-0.5(1 - 0.63) + 4(0.042 - 0.1) - (0.1 - 0.147)

First, simplify the expressions inside the parentheses:

-0.5(0.37) + 4(-0.058) - (0.1 - 0.147)

Now, perform the multiplications:

-0.185 - 0.232 - (0.1 - 0.147)

Next, subtract the numbers inside the parentheses:

-0.185 - 0.232 - (-0.047)

Now, subtract the remaining values:

-0.185 - 0.232 + 0.047

Now, add the numbers:

-0.37 + 0.047

Finally, perform the addition:

-0.323

So, when n = 0.21, the expression evaluates to approximately -0.323.