Odpowiedź:
[tex]a)\ \ 5a(a^2-2a)-(a^3-3a+5)=5a^3-10a^2-a^3+3a-5=4a^3-10a^2+3a-5\\\\\\b)\ \ x(6x+5y-8z)=6x^2+5xy-8xz\\\\\\c)\ \ 4k(0,25k+0,5m-2)=k^2+2km-8k\\\\\\d)\ \ 4x(x+y)-4(x^2+xy-y)=4x^2+4xy-4x^2-4xy+4y=4y\\\\\\e)\ \ 7(x-1)+5(x^2+2)=7x-7+5x^2+10=5x^2+7x+3[/tex]
