Помогите пожалуйста , срочно!

1

а) (2+b)(3b+2) = 6b+4+3b+2b = 3b+8b+4

б) (5b-b)(2+3b) = 10b+15b-2b-3b = -3b+13b+10b

в) (2-b)(3-5b) = 6-10b-3b+5b = 5b-13b+6

г) (-3b-4)(2b-5) = -6b+15b-8b+20 = -6b+7b+20

2

а) 9-(3+a)(2a+3) = 9- (6a+9+2a+3a) = 9-(2a+9a+9) = 9-2a-9a-9 = 2a-9a

б) 4a+(a-a)(3+4a) = 4a+(3a+4a-3a-4a) = 4a+3a+a-4a = a+3a

в) (1-2x)(2+x)+(1-x)(2-2x) = (2+x-4x-2x)+(2-2x-2x+2x) = -2x-3x+2+2x-4x+2 = -7x+4

г) (x-3)(x-4)-(x-5)(x-2) = (x-4x-3x+12)-(x-2x-5x+10) = x-7x+12-(x-7x+10) = x-7x+12-x+7x-10 = 2

3

а) 14x+7x = 7x(2+x)

б) x(x-4)-5(x-4) = (x-4)(x-5)

4

а) 2(x-3)+x-3x = 2(x-3)+x(x-3) = (x-3)(2+x)

б) 3x-6-x(x-2) = 3(x-2)-x(x-2)=(x-2)(3-x)

в) x+4x-3x-12 = (x+4x)-(3x+12) = x(x+4)-3(x+4) = (x+4)(x-3)

г) x-5x-3x+15 = (x-5x)-(3x-15) = x(x-5)-3(x-5) = (x-5)(x-3)