Найдите значение выражения. а) (7 1/2 + 3 2/3)*6= б) (9-1

а) (7 1/2 + 3 2/3) * 6= 67;

1) 7 1/2 + 3 2/3 = 15/2 + 11/3 = 45/6 + 22/6 = 67/6 = 11 1/6;

2) 11 1/6 * 6 = 67/6 * 6 = 67;

б) (9 - 1 1/7) * 7 = 55;

1) 9 - 1 1/7 = 8 7/7 - 1 1/7 = 7 6/7;

2) 7 6/7 * 7 = 55/7 * 7 = 55;

в) (6 + 1 1/3 * 2) * 30 = 260;

1) 1 1/3 * 2 = 4/3 * 2 = 8/3 = 2 2/3;

2) 6 + 2 2/3 = 8 2/3;

3) 8 2/3 * 30 = 26/3 *30 = 26 * 30 / 3 = 260;

г) 7 7/11 * 3 2/5 + 7 7/11 * 7 3/5 = 7 7/11 * (3 2/5 + 7 3/5) = 84; 

1) 3 2/5 + 7 3/5 = 17/5 + 38/5 = 55/5 = 11;

2) 7 7/11 * 11 = 84/11 * 11 = 84 * 11 / 11 = 84; 

д) 5 3/4 * 3 5/7 + 3 5/7 * 1 1/4 = 3 5/7 * (5 3/4 + 1 1/4) = 26; 

1) 5 3/4 + 1 1/4 = 6 4/4 = 7;

2) 3 5/7 * 7 = 26/7 * 7 = 26;