Question

20 Efectuați calculele:
a) V50:V5;
b) V15:(-V3);
c) -V35:(-V7);
d) 4V21:V7;
e) (-9/V14):V2
f)(16V42):(-8V7)

Answer 1

$\huge\sqrt{x} \div \sqrt{y} = \sqrt{x \div y}$

a)

$\sqrt{50} \div \sqrt{5} = \\ = \sqrt{50 \div 5} = \sqrt{10}$

b)

$\sqrt{15} \div ( - \sqrt{3} ) = \\ = - \sqrt{15 \div 3} = - \sqrt{5}$

c)

$- \sqrt{35} \div ( - \sqrt{7} ) = \\ = \sqrt{35 \div 7} = \sqrt{5}$

d)

$4 \sqrt{21} \div 7 = \\ = 4 \sqrt{21 \div 7} = 4 \sqrt{3}$

e)

$- 9 \sqrt{14} \div \sqrt{2} = \\ = - 9 \sqrt{14 \div 2} = - 9 \sqrt{7}$

f)

$16 \sqrt{42} \div ( - 8 \sqrt{7}) = \\ = 16 \div ( - 8)\sqrt{42 \div 7} = \\ = - 2 \sqrt{6}$