Question

дам за это 35 баллов 7 класс

Answer 1

1. (5x-2)*(х²/5+2х/5+1/25)=х³+2х²+х/5-2х²/5-4х/5-2/25=х³-(8х²/5)-(3х/5)-2/25

2. ху*(х+у²)=х²у+ху³

3. х²*(х²+у²+12/х²)=х⁴+х²у²+12

Answer 2

$1)\ \ (5x-2)\Big(\dfrac{x^2}{5}+\dfrac{2x}{5}+\dfrac{1}{25}\Big)=(5x-2)\cdot \dfrac{5x^2+10x+1}{25}=\dfrac{(5x-2)\cdot (5x^2+10x+1)}{25}=\\\\\\=\dfrac{25x^3+50x^2+5x-10x^2-20x-2}{25}=\dfrac{25x^3+40x^2-15x-2}{25}=\\\\\\=x^3+1,6x^2-0,6x-0,08\\\\\\2)\ \ xy\cdot (x+y^2)=xy^2+xy^3\\\\\\3)\ \ x^2\cdot \Big(x^2+y^2+\dfrac{12}{x^2}\Big)=x^4+x^2y^2+12$