Question

tính

\(a.\sqrt{0,45.0,36}\)

b.\(\dfrac{\sqrt{405}+3\sqrt{27}}{3\sqrt[]{3}+45}\)

c.\(\sqrt{252}-\sqrt{700}+\sqrt{1008}-\sqrt{448}\)

d.\(\left(\sqrt{12}-2\sqrt{75}\right)\sqrt{3}\)

Answer 1

c.

=(6-10+12-8)\(\sqrt{7}\)

=0

Answer 2

d.

Answer 3

Tiếp nè bạn

\(\dfrac{\sqrt{405}+3\sqrt{27}}{3\sqrt{3}+3\sqrt{5}}\)

\(=\dfrac{9\sqrt{5}+9\sqrt{3}}{3\sqrt{3}+3\sqrt{5}}\)

\(=\dfrac{9+9}{3+3}\)

\(=\dfrac{18}{6}=3\)

Answer 4

a) \(\sqrt{0,45.0,36}\)

=\(\sqrt{0,162}\)

=\(\sqrt{\dfrac{81}{500}}\)

=\(\dfrac{9}{\sqrt{500}}\)

=\(\dfrac{9}{10\sqrt{5}}\)

Answer 5

Answer 6

Answer 7

\(\left(\sqrt{12}-2\sqrt{75}\right).\sqrt{3}\)

\(\left(2\sqrt{3}-2.5\sqrt{3}\right).\sqrt{3}\)

\(\left(2\sqrt{3}-10\sqrt{3}\right).\sqrt{3}\)

\(-8\sqrt{3}.\sqrt{3}\)

\(-8.3=-24\)