Question

(3v20-2v45+v405)×0,(3)
repede va rogggggggggggg
dau coroana si 5 stele
v=radical​

Answer 1

Răspuns:    3√5

Explicație pas cu pas:

(3√20 - 2√45 + √405) x 0.(3) =

(3√(4x5)  -  2√(9x5)  +  √(81x5) ) x 3/9 =

(3×2√5 - 2×3√5 + 9√5) x 1/3 =

(6√5 - 6√5 + 9√5) x 1/3 =

9√5 x 1/3 =

9√5/3 =

3√5

Answer 2

$\it (3\sqrt{20} - 2\sqrt{45} + \sqrt{405}) \cdot 0,(3) = (3\sqrt{4\cdot5}-2\sqrt{9\cdot5}+\sqrt{81\cdot5})\cdot\dfrac{\ 3^{(3}}{9}=\\ \\ \\ =(6\sqrt5-6\sqrt5+9\sqrt5)\cdot\dfrac{1}{3}=9\sqrt5\cdot\dfrac{1}{3}=3\sqrt5$