zad 1.
(3-2y)(3+2y)+(2y-3)²=
=9 + 6y - 6y - 4y² + 4y² - 12y + 9 = 18 - 12 y
zad 2x - szerokosc
x + y - dlugosc
4a = 2x + 2 ( x + y)
4a = 4x + 2y
a = x + 1/2y
Pkwadratu = a²
a² = ( x + 1/2y ) ²
a² = x² + xy + 1/4y²
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zad 1.
(3-2y)(3+2y)+(2y-3)²=
=9 + 6y - 6y - 4y² + 4y² - 12y + 9 = 18 - 12 y
zad 2
x - szerokosc
x + y - dlugosc
4a = 2x + 2 ( x + y)
4a = 4x + 2y
a = x + 1/2y
Pkwadratu = a²
a² = ( x + 1/2y ) ²
a² = x² + xy + 1/4y²