Question

a=3rad7-5rad2= ajutati-ma va rog

Answer 1

A = 3√7 - 5√2 =
A= √9·7 - √25·2
A= √63 - √50
A= √13

Answer 2

 $3\sqrt7-5\sqrt2= 3\sqrt7-5\sqrt2\;;\\ daca\;se\;cere\;o\;valoare\;aproximativa\,,\;\\ atunci...\sqrt7\approx2,64\;si\;\sqrt2\approx1,41\;;\\ \Rightarrow\;\;A=3\cdot2,64\,-\,5\cdot1,41=7,92-7,05\,\approx\,0,87$