Question

Viết các biểu thức sau về dạng bình phương

a,21-6 căn6

b,55-6 căn6

c,14-6 căn5

d,13+4 căn10

Answer 1

a/ \(\left(\sqrt{18}\right)^2-2\cdot\sqrt{18}\cdot\sqrt{3}+\left(\sqrt{3}\right)^2=\left(\sqrt{18}-\sqrt{3}\right)^2\)

b/\(\left(\sqrt{54}\right)^2-2\cdot\sqrt{54}+1=\left(\sqrt{54}-1\right)^2\)

c/\(\left(\sqrt{9}\right)^2-2\cdot\sqrt{9}\cdot\sqrt{5}+\left(\sqrt{5}\right)^2=\left(\sqrt{9}-\sqrt{5}\right)^2\)

d/\(\left(\sqrt{8}\right)^2+2\cdot\sqrt{8}\cdot\sqrt{5}+\left(\sqrt{5}\right)^2=\left(\sqrt{8}+\sqrt{5}\right)^2\)