Question

Раскройте скобки
b+(-7m+2n)
-(a-4b)+(-8x+3y)
(a-9)-(13-a)+(11-a)

Answer 1

(b-7m+2n-a+4b-8x-3y)(a-9-13+a+11-a)=(5b -a-7m+2n-8x+3y)(a-11)=5ab-55b-a^2+22a-7am+77m+2an-22n-8ax+88x+3ay-33y