Đối vs mk bn đấng giá 0đ vì mk k những k quen mà từ xưa đến nay mk chưa bt đến bn

Our lesson _____ at 7.30 a.m every morning.

A. begins

B. beginning

C. began

D. begin

x=11-1\(\rightarrow\)x=10

\(\sqrt{x=1}=1\)

\(\sqrt{4}+\sqrt{9}+\sqrt{16}+\sqrt{25}=2+3+4+5=14\)

a,\(27^{11}=\left(3^3\right)^{11}=3^{33}\)

\(81^8=\left(3^4\right)^8=3^{32}\)

Vì \(3^{33}>3^{32}\Rightarrow27^{11}>81^8\)

b,\(3^{150}=\left(3^2\right)^{75}=9^{75}\\ 2^{225}=\left(2^3\right)^{75}=8^{75}\)

Vì \(9^{75}>8^{75}\Rightarrow3^{150}>2^{225}\)

c,Ta có :\(\dfrac{27^{50}}{240^{30}}\)

=\(\dfrac{27^{30}.27^{20}}{240^{30}}\)

=\(\dfrac{3^{30}.3^{30}.3^{30}.3^{20}.3^{20}.3^{20}}{3^{30}.80^{30}}\)

=\(\dfrac{3^{120}}{80^{30}}\)=\(\dfrac{\left(3^4\right)^{30}}{80^{30}}\)=\(\dfrac{81^{30}}{80^{30}}\)

\(\rightarrow\)\(\dfrac{81^{30}}{80^{30}}>1\rightarrow\dfrac{27^{50}}{240^{30}}>1\Rightarrow27^{50}>240^{30}\)