Выполните действия:
A) (х+3) (x-3)=
Б) (3x+2y) В) (а-2) =
г) (112x? +4y) (12x4y) =
A) (х+3) (x-3)=
Б) (3x+2y) В) (а-2) =
г) (112x? +4y) (12x4y) =
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Answers & Comments
1.
А) (х+3)(х-3)=х^2-3^2=х^2-9
Б) (3х+2у)^2=(3х)^2+2×3×2у+(2у)^2=9х^2+12ху+4у^2
В) (а-2)^2=а^2-4а+4
Г) (1/2х^2+4у)(1/2х^2-4у)=(1/2х^2)^2+(4у)^2=1/4х^4+16у^2