Question

lập các cặp phân số bằng nhau từ 4 trong 5 số sau : 1;3;9;27;81

Answer 1

1.27 = 3.9 => 1/9 = 3/27; 1/3 = 9/27; 27/9 = 3/1; 27/3 = 9/1

3.81 = 9.27 => 3/9 = 27/81; 9/3 = 81/27; 3/27 = 9/81; 27/3 = 81/9

1.81 = 3.27 => 1/27 = 3/81; 1/81 = 3/27; 3/1 = 81/27; 27/1 = 81/3 

Answer 2

1.27 = 3.9 => 1/9 = 3/27;

1/3 = 9/27; 27/9 = 3/1; 27/3 = 9/1 3.81 = 9.27

=> 3/9 = 27/81; 9/3 = 81/27; 3/27 = 9/81; 27/3 = 81/9 1.81 = 3.27

=> 1/27 = 3/81; 1/81 = 3/27; 3/1 = 81/27; 27/1 =