= 176770

ủng hộ mk nhak, mk cảm ơn rất nhìu

A: T;O;I;Y;E;U;V;N;A;M

B: T;A;P;H;O

C: U;O;N;G;C;H

D: C;H;I;N;G;A;E;M

\(\sqrt{14-6\sqrt{5}}\)

\(=\sqrt{9+6\sqrt{5}+5}\)

\(=\sqrt{3^2-2\cdot3\cdot\sqrt{5}+\sqrt{5^2}}\)

\(=\sqrt{\left(3-\sqrt{5}\right)^2}\)

\(=3-\sqrt{5}\)

\(\sqrt{72}+\sqrt{4\frac{1}{2}}\)

\(=6\sqrt{2}+\frac{3}{2}\sqrt{2}\)

\(=\left(6+\frac{3}{2}\right)\sqrt{2}\)

\(=\frac{15}{2}\sqrt{2}\)

2+2+2+2+2+2=10

a) \(x-2\sqrt{x}\)

\(=\sqrt{x}\left(\sqrt{x}-2\right)\)

b) \(6+\sqrt{x}-x\)

\(=6+3\sqrt{x}-2\sqrt{x}-x\)

\(=\left(6+3\sqrt{x}\right)-\left(2\sqrt{x}+x\right)\)

\(=3\left(2+\sqrt{x}\right)-\sqrt{x}\left(2+\sqrt{x}\right)\)

\(=\left(3-\sqrt{x}\right)\left(2+\sqrt{x}\right)\)

cả 2 bạn có:

5+5=10 (trái)

đ/s : 10 trái