Выполнить умножение a)(2x - y)(x + y) б)(а +b)(2a + 3b) в)(3с + a)(2c - a) г)(6z - y)(2z - y) д)(5x - c)(x - 5c) е)(4m

Выполним умножение и упростим:

1) (2x - y) * (x + y) = 2x^2 + 2xy - xy - y^2 = 2x^2 + xy - y^2;

2) (a + b) * (2a + 3b) = 2a^2 + 3ab + 2ab + 3b^2 = 2a^2 + 5ab + 3b^2;

3) (3c + a) * (2c - a) = 6c^2 - 3ac + 2ac - a^2 = 6c^2 - ac - a^2;

4) (6z - y) * (2z - y) = 12z^2 - 6yz - 2yz + y^2 = 12z^2 - 8yz + y^2;

5) (5x - c) * (x - 5c) = 5x^2 - 25xc - xc + 5c^2 = 5x^2 - 26xc + 5c^2;

6) (4m + 3n) * (4m + 3n) = 16m^2 + 12mn + 12mn + 9n^2 = 16m^2 + 24mn + 9n^2;

7) (3y - 2v) * (3y + 2v) = 9y^2 + 6yv - 6yv - 4v^2 = 9y^2 - 4v^2;

8) (10x + 3z) * (10x - 5z) = 100x^2 - 50xz + 30xz - 15z^2 = 100x^2 - 20xz - 15z^2.