Предмет: Алгебра, автор: nailguliev

помогите решить.40ab+2(5a-2b)^2.при а= корень из 11,а b=корень из 5

Ответы

Автор ответа: к5о5т5я
0
40ab+2(5a-2b)^2=40ab+50a^2-40ab+8b^2=50a^2+8b^2\

при
 a= sqrt{11} ;   b= sqrt{5} \ 50*11+8*5=550+40=590
 
Ответ 590
Автор ответа: nailguliev
0
я понял
Автор ответа: nailguliev
0
просто мы же 2 умножаем на 25=50 и 2 умножаем на 4=8
Автор ответа: nailguliev
0
просто мне не понятно зачем еще 40
Автор ответа: к5о5т5я
0
внимательно, ещё раз посмотрите как разложен квадрат разности, далее сокращаем, остаётся два слагаемых
Автор ответа: nailguliev
0
спасибо большое))
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