1. выражение, 2 разложить на множители 1. (5x+1)(5x-1); 7y2 x (-2y^5); (y+1)(1-y) 5m^3-m+4m^2-m-m^2 2. 7y-xy; a^2-100; y-10y+25; 49+14k+k^2;

1. 25х2-1; -14у^7; у2-1; 5m^3-2m+3m^2.
2. y(7-x)

1)
(5x+1)(5x-1)=25x²-1
7y²(-2y⁵)=-14y⁷
(y+1)(1-y)=1-y²
5m³-m+4m²-m-m²=5m³+3m²-2m
2)
7y-xy=y(7-x)
a²-100=(a-10)(a+10)
y-10y+25=25-9y
49+14k+k²=(7+k)²=(7+k)(7+k)