А)(3/4+1/6) :3+(5/6-1/2):9б) (3/4-5/12) yмножить 3-1/16:1/8

а) (3/4 + 1/6) : 3 + (5/6 - 1/2) : 9 = 3 11/36.

1) 3/4 + 1/6 = 9/12 + 2/12 = 11/12;

2) 5/6 - 1/2 = 5/6 - 3/6 = 2/6 = 1/3;

3) 11/12 : 3 = 11/12 * 1/3 = 11/36;

4) 1/3 : 1/9 = 1/3 * 9/1 = 3;

5) 11/36 + 3 = 3 11/36.

Ответ: (3/4 + 1/6) : 3 + (5/6 - 1/2) : 9 = 3 11/36.

б) (3/4 - 5/12) * 3 - 1/16 : 1/8 = 1/2.

1) 3/4 - 5/12 = 9/12 - 5/12 = 4/12 = 1/3;

2) 1/3 * 3 = 3/3 = 1;

3) 1/16 : 1/8 = 1/16 * 8/1 = 1/2;

4) 1 - 1/2 = 2/2 - 1/2 = 1/2.

Ответ: (3/4 - 5/12) * 3 - 1/16 : 1/8 = 1/2.