Question

упростите  выражение 
(x-4)(x-5)-2x(x-6)
7y(x+y-p)-7p(x-y-p)+7y(x-y+p)

Answer 1

(х-4)(х-5)-2х(х-6)=
=х^2-5х-4х+20-2х^2+12х=
=-х^2+3х+20

7у(х+у-р)-7р(х-у-р)+7у(х+у+р)=
=7ху+7у^2-7ур-7хр+7ур+7р^2+7ху+7у^2+7ур=
=14ху+14у^2-7хр+7ур+7р^2

^2 - в квадрате

Answer 2

-0,5у(4-2у^2)(у^2+3)=-0,5у(4у^2+12-2у^4-6у^2)=

Answer 3

-0,5у(4-2у^2)(у^2+3)=-0,5у(4у^2+12-2у^4-6у^2)=-2у^3-6у+у^5+3у^3=у^5+у^3-6у