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hadoka09hadi
@hadoka09hadi
August 2022
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докажите тождество (x+2y)^2-(x-2y)^2=8xy
7 класс
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love67
Verified answer
)х+2у)²-(х-2у)²=
х²
+4ху+
4у
²
-х²
+4ху
-4у²
=8ху
20 votes
Thanks 51
love67
только подчеркни х² и - х² ( одной чертой)
love67
а 4у² и -4у² ( двумя или волнистой линией) не знаю,как у вас в школе делают))
love67
осталось 4ху+4ху=8ху
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Answers & Comments
Verified answer
)х+2у)²-(х-2у)²=х²+4ху+4у²-х²+4ху-4у²=8ху