Question

5a(2-a)+6a(a-7)=
20x+5(x-2)²=
25y-y³=
-4x²+8xy-4y²=

16 в²
- - =
81

-y²+2y-5=
(3x+x²)²-x²(x-5) (x+5)+2x(8-3x²)=

Answer 1

решеение во вложениии