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sonygonharova
@sonygonharova
July 2022
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а)(5a+2b)^2
б)(2x-3y)^2
в)(3a+n)(n-3a)
г)(3a-2)(3a+2)
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rubilovalex
А). (5a+2b)^2=(5a)^2+2*5a*2b+(2b)^2=25a^2+20ab+4b^2; б). (2x-3y)^2=(2x)^2-2*2x*3y+(3y)^2=4x^2-12xy+9y^2; в). (3a+n)(n-3a)=3an-9a^2+n^2-3an=n^2-9a^2; г). (3a-2)(3a+2)=9a^2+6a-6a-4=9a^2-4.
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