Упростите выражение и найдите его при а =1,44 А)1целых 4 /9а-1/3а-5/12а

а = 1,44 = 1 44/100 = 1 11/25;

А) 1 4/9а -1/3а - 5/12а = 1 4/9 * 1 11/25 - 1/3 * 1 11/25 - 5/12 * 1 11/25 = 1; 

1) 1 4/9 * 1 11/25 = 13/9 * 36/25 = 13 * 36/9 * 25 = 13 * 4/1 * 25 = 52/25 = 2 2/25;

2) 1/3 * 1 11/25 = 1/3 * 36/25 = 1 * 36/3 * 25 = 1 * 12/1 * 25 = 12/25;

3) 5/12 * 1 11/25 = 5/12 * 36/25 = 5 * 36/12 * 25 = 1 * 3/1 * 5 = 3/5;

4) 2 2/25 - 12/25 = 52/25 - 12/25 = (52 - 12)/25 = 40/25 = 1 15/25 = 1 3/5;

5) 1 3/5 - 3/5 = 1;