Question

Упростите выражение:
а)(a+5b)(a-b+3)-(a-b)(a+5b-3)
б)(x+3y)(x+y+2)-(x+y)(x+3y+2)

Answer 1

а) a²-ab+3a+5ab-5b²+15b-a²-5ab+3a+ab+5b²-3b=6a-12b
б) x²+xy+2x+3xy+3y²+6y-x²-3xy-2x-xy-3y²-2y=4y

Answer 2

Неверно.

Answer 3

а)...=$a^{2} -ab+3a+5ab-5 b^{2} +15b- a^{2} -5ab+3a+ab+5 b^{2} -3b=18a$
б)...=$x^{2} +xy+2x+3xy+3 y^{2} +6y- x^{2} -3xy-2x-xy-3 y^{2} -2y=4y$