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lenavolkova
@lenavolkova
August 2021
1
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упростите выражение (2a-b)(2a+b)+b^2 (x+y)^2+(x-y)^2-2x^2
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9rita9
(2a-b)(2a+b)+b^2= 4a^2+2ab-2ab-b^2+b^2=4a^2
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