ПОМОГИТЕ!!ОЧЕНЬ НУЖНО!! . Created by vika170420. algebra-ru

ПОМОГИТЕ!!ОЧЕНЬ НУЖНО!! ...

manyny06

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Вариант 1 .
х²-2ху+у² -х² +у²= 2у²-2ху
вариант 2.
х²-у² +х² +2ху+у² = 2х²+2ху

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vika170420 Вы просто бог"""!

manyny06 всегда рада помочь!!!!!!

julyap $1)(x-y) ^{2} -(x+y)(x-y)= x^{2} +y ^{2} -2xy- x^{2} +y ^{2} = \\ =2y ^{2} -2xy \\ \\$

$2) (x+y)(y-x)+(x+y) ^{2} =y ^{2} - x^{2} + x^{2} +y^{2} +2xy=2y ^{2} +2xy$

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