Ответ:
(2х+у)^2 +(2х-у)^2 =4Х^2 +4ХУ+У^2 +4х^2 - 4ху+у^2 =8х^2 +2у^2
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Ответ:
(2х+у)^2 +(2х-у)^2 =4Х^2 +4ХУ+У^2 +4х^2 - 4ху+у^2 =8х^2 +2у^2