55/21<134/43<116/37<77/19

55/21<134/43<116/37<77/19 

55/21<134/43<116/37<77/19

Đặt \(2000=a\)

\(A=a^9\\ B=\left(a-4\right)\left(a-3\right)\left(a-2\right)\left(a-1\right)a\left(a+1\right)\left(a+2\right)\left(a+3\right)\left(a+4\right)\\ B=\left(a^2-16\right)\left(a^2-9\right)\left(a^2-4\right)\left(a^2-1\right)a< a.a^2.a^2.a^2.a^2=a^9\\ B=\left(a-8\right)\left(a-6\right)\left(a-4\right)\left(a-2\right)a\left(a+2\right)\left(a+4\right)\left(a+6\right)\left(a+8\right)\\ C=\left(a^2-64\right)\left(a^2-36\right)\left(a^2-16\right)\left(a^2-4\right)a\\ C< \left(a^2-9\right)\left(a^2-4\right)\left(a^2-1\right)a< a.a^2.a^2.a^2=a^9\\ D=\left(a-20\right)\left(a-15\right)\left(a-10\right)\left(a-5\right)a\left(a+5\right)\left(a+10\right)\left(a+15\right)\left(a+20\right)\\ D=\left(a^2-400\right)\left(a^2-225\right)\left(a^2-100\right)\left(a^2-25\right)a\\ D< \left(a^2-64\right)\left(a^2-36\right)\left(a^2-16\right)\left(a^2-4\right)a< a.a^2.a^2.a^2=9\)

Vậy \(D< C< B< A\)

1 How often does your mother go to the seaside for a holiday?

2 Much of this dangerous waste goes into the air

3 He knows fewer English words than his brother

4 We are making some coffee but we do not have any milk

1, -2015; -11; -10; -9; 0; 9; 10; 12; 23

2, -1000; -100; -43; -15; 0; 105; 1000

nhưng ma câu ý cần cách làm chứ

Đáp án cần chọn là: B

Các số được xếp theo thứ tự giảm dần là: 1280;43;28;1;0;−52;−291

\(\frac{7}{4};\frac{11}{8};\frac{43}{41};\frac{91}{89}\)

Thứ tự giảm dần là 

   91/89 ; 43/41 ; 11/8 ; 7/4