УПРОСТИТЬ2x+3) (5x-4). (3a-2) (2a-1). (5a-3b) (4a-b). (3x+2y) (x-y)

(2x+3) (5x-4)=10x^2+15x-8x-12=10x^2+7x-12 (3a-2) (2a-1)=6a^2-4a-3a+2=6a^2-7a+2 (5a-3b) (4a-b)=20a^2-12ab-5ab+3b^2=20a^2-17ab+3b^2 (3x+2y) (x-y)=3x^2+2xy-3xy-2y^2=3x^2-xy-2y^2 (5b-4c) (2b-2c)=10b^2-8bc-10bc+8c^2=10b^2-18bc+8c^2 (p-3q) (8p+5q)=8p^2-24pq+5pq-15q^2=8p^2-19pq-15q^2