Question

Помогите пожалуйста с дз

Answer 1

Ответ:

Объяснение:

1)  (5с-4y)(-8c-2x+6y) = -40c²-10cx+30cy+32cy+8xy-24y²=

=-40c²-10cx+62cy+8xy-24y².

2)  (4b-c)(-5b+3c-4y) = -20b²+12bc-16by+5bc-3c²+4cy=

= -20b²+17bc-16by+4cy-3c².

3)  (4x-3y+2z)(3x-3y) = 12x²-12xy-9xy+9y²+6xz-6zy =

= 12x²-21xy+9y²+6xz-6yz.

4)  (3a-3b+4c)(3a-5b) =9a²-15ab-9ab+15b²+12ac-20bc =

= 9a²-24ab+15b²+12ac-20bc.

Answer 2

1) (5c-4y) (-8c-2×+6y) =
-40c2-10cx+30cy+32cy+8xy-24y?=
=-40c2-10cx+62cy+8xy-24y?.
2) (4b-c)(-5b+3c-4y) =
-20b2+12bc-16bv+5bc-3c2+4cv=
=-20b2+17bc-16by+4cy-302.
3) (4x-3v+2z)(3x-3y) =
12×2-12xy-9xy+9y?+6xz-6zy =
=12×2-21xy+9y2+6×z-6yz.
4) (3a-3b+4c) (3a-5b)
=9a2-15ab-9ab+15b2+12ac-20bc =
= 9a2-24ab+15b2+12ac-20bc.