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