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lizaicy
@lizaicy
August 2022
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Помогите мне решить: упростите выражение и вычислите
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кляча
Verified answer
№2
= (а^2 + b^2) / ((a-b)(a+b)) - (a-b)/ (a+b) =
= a^2 + b^2 - (a-b)^2)
= a^2 + b^2 - a^2 + 2ab - b^2 = 2ab
---------------------------------------------------------------------------------
№4
= (Y7)^2 - 2Y(7*2) + (Y2)^2 + Y(4*14) =
= 7 - 2Y14 + 2 + 2Y14 = 9
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Answers & Comments
Verified answer
№2= (а^2 + b^2) / ((a-b)(a+b)) - (a-b)/ (a+b) =
= a^2 + b^2 - (a-b)^2)
= a^2 + b^2 - a^2 + 2ab - b^2 = 2ab
---------------------------------------------------------------------------------
№4
= (Y7)^2 - 2Y(7*2) + (Y2)^2 + Y(4*14) =
= 7 - 2Y14 + 2 + 2Y14 = 9