Zapisz w jak naprostszej postaci
a) (a+3)(a-1)+(a-7)(a+5)
b)(2b-5)(3-2b)-(3b+2)(b-6)
c)-7c do kwadratu(5c-4)+(3c do kwadratu+c)(6-2c)
d)3m(m-4)(5m+2)-m(2m+3)(4-3m)
e)-2x(3x-5y)-(x+2y)(3x-y)