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scrieti sub forma de patrat al sumei 27+10radical2

Răspuns :

(27+10√2)²=
27²+2x27x10√2+(10√2)²=
729+540√2+100x2=
729+540√2+200=
929+
540√2
deoarece (a+b)²=a²+2ab+b²⇒(27+10√2)²=27²+2·27·10√2+(10√2)²=
=729+540√2+200=929+540√2