Ответ:
Объяснение:
(2a-5)²+a(20-5a)=
=4a²-20a-25+20a-5a²=
= - a²-25= -(a²-25)=-(a-5)(a+5)
-(a-5)(a+5)= pri a=√5
= - (√5-5)(√5+5)= - (5-25)= - (-20)=20
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Ответ:
Объяснение:
(2a-5)²+a(20-5a)=
=4a²-20a-25+20a-5a²=
= - a²-25= -(a²-25)=-(a-5)(a+5)
-(a-5)(a+5)= pri a=√5
= - (√5-5)(√5+5)= - (5-25)= - (-20)=20