Question

1. 4a x (a-1) x (3+y)-y(2+x) 2. 7xy x 2x^2 - 1/2 a^2b x 4ab^2 3. (25x^2y^3-5xy^2)= 4. b (3-b+4 (b+b^2), b = 2 Срочно, подробно.

Answer 1

1. 4а×(а-1)=4а2-4а
x(3+y)-y(2+x)=3x-2y

Answer 2

Sure, I'll help you simplify each expression step-by-step:

1. 4a x (a-1) x (3+y) - y(2+x)

To simplify this expression, we can start by expanding the terms inside the parentheses:

4a x (a-1) x (3+y) = 4a(a-1)(3+y) = 4a(a(3+y)-1(3+y)) = 4a(a(3)+a(y)-3-y) = 4a(3a+ay-3-y)

Next, let's deal with the second part of the expression:

y(2+x) = y(2)+y(x) = 2y+yx

Now we have the simplified expression:

4a(3a+ay-3-y) - (2y + yx)

2. 7xy x 2x^2 - 1/2 a^2b x 4ab^2

Let's first simplify each part separately:

7xy x 2x^2 = 14x^3y

1/2 a^2b x 4ab^2 = 2a^2b^3

Now we have the simplified expression:

14x^3y - 2a^2b^3

3. (25x^2y^3 - 5xy^2) =

This expression is already simplified. There is no equal sign, so it seems to be an incomplete expression. If you intended to solve an equation or simplify further, please provide the complete expression or equation.

4. b(3-b+4(b+b^2)), b = 2

To simplify this expression, substitute b with the value 2:

b(3-b+4(b+b^2)) = 2(3-2+4(2+2^2))

Now perform the operations inside the parentheses:

2(3-2+4(2+4)) = 2(3-2+4(6)) = 2(3-2+24)

Finally, perform the remaining operations:

2(3-2+24) = 2(25) = 50

So, the simplified value of the expression when b=2 is 50.

Please double-check the expressions and equations provided to ensure accuracy, as there may have been some typos or missing information in the original text. If you have any more questions or need further assistance, feel free to ask!