Odpowiedzi

2010-02-04T17:22:54+01:00
(3-2y)(3+2y)+(2y-3)² = 3² - (2y)² + 4y² - 2*2y*3 - 3² = 9 - 4y² + 4y² - 12y - 9 =
redukacja wyrazów podobnych:
=-12y

(3-2y)(3+2y)+(2y-3)² = -12y
3 3 3
2010-02-04T17:23:42+01:00
(3-2y)(3+2y)+(2y-3)² =
= (3² -4y²) + (4y² - 12y + 9 ) =
= 9 -4y² + 4y² -12y +9=
= - 12y + 18 =
= -6(2y - 3)
2 5 2
2010-02-04T17:23:46+01:00
1y * 5y * (-1)²=1y*5y*1=5y