Question

Dupa ce ati scos factorii de sub radical, restrangeti. 
a)  √8+√50-√32=......rez.com.
b).   -√45+6√5-√80+√5=...
c).   4√1331-√1100-33√11+√44=...

Answer 1

a)  √8 + √50 - √32 = 

= √2·2² + √2·5² - √2·4²

= 2√2 + 5√2 - 4√2

= 3√2

b) -√45 + 6√5 - √80 + √5 =

= -√5·3² + 6√5 - √5·4² + √5

= -3√5 + 6√5 - 4√5 + √5

= 7√5 - 7√5

= 0

c) 4√1331 - √1100 - 33√11 + √44 =

= 4√11·11² - √11·10² - 33√11 + √11·2²

= 44√11 - 10√11 - 33√11 + 2√11

= 3√11