Question

выполните умножения
(x+y)(m-n)=
(1+a)(1-b)=
(a+b)(-m-n)=
(2x+3y)(3x-2y)=
(0,5a-2,3)(0,5a+2,3)=
СРОЧНО!!!!!​

Answer 1

Ответ:

$(x + y)(m - n) = xm - xn + ym - yn \ \\ (1 + a)(1 - b) = 1 - b + a - ab \\ (a + b)( - m - n) = - am - an - bm - bn \\ (2x + 3y)(3x - 2y) = 6 {x}^{2} - 4xy + 9xy - 6 {y}^{2} \\ (0.5a - 2.3)(0.5a + 2.3) = 0.25 {a}^{2} + 1.15a - 1.15a - 5.29 = 0.25 {a }^{2} - 5.29$

Answer 2

Ответ:

1)xm-xn+ym-yn

2)1-b+a-ab

3)-am-an-bm-bn

4)6x2-4xy+9xy-6y2

5)0.25a2-5.29