1 ) 9x^2 - 4y^2 - 3x + 2y=(3х-2у)(3х+2у)-(3х-2у)=(3х-2у)(2х+2у-1)
2 ) 81 - ( 3 - 8y )^2=(9-3+8у)(9+3-8у)=(6+8у)(12-8у)=8(3+4у)(3-2у)
3 ) 36 - ( y + 1 )^2=(6-у-1)(6+у+1)=(5-у)(7+у)
4 ) ( 4 - 5x )^2 - 64 =(4-5х-8)(4+5х+8)=-(4+5х)(12+5х)
Формула сокращенного умножения
(а-в)(а+в)=а^2-в^2