Question

14. Efectuează: a) 3√125-2√21-√√35; b)√108: √27:4; c) 2√5(-√45)+3√12. 28 84 ​

Answer 1

a) 3√125-2√21-√√35=3×5√5-2√21-√35=

15√5-2√7×3-√7×5=15√5-√7(√3-√5)

b)√108: √27:4=√(108:27):4=√4:4=2/4=1/2

c) 2√5(-√45)+3√12. 28 84 =

-2√5×3√5+3×2√3. 28 84=

-6×5+2√3. 28 84 ????