Question

Упростить выражение
1) (2х+1)(5х-4)
2) (5а-3b)(4a-b)
3) (3x+2y)(x-y)
4) (p-3g)(8p+5g)

Answer 1

$10x^2+5x-8x-4=10x^2-3x-4 \ 20a^2-12ab-5ab+3b^2=20a^2-17ab+3b^2 \ 3x^2+2xy-3xy-2y^2=3x^2-xy-2y^2 \ 8p^2-24pg+5pg-15g^2=8p^2-19pg-15g^2$