1) 15 4/9 - 4 4/9 × 3 3/8 = 15 4/9 - 4 4/9 × 27/8 = 15 4/9 - 18/9 × 27/8 = 15 4/9 - 81/8 = 141/9 - 81/8 = 126/9 - 81/8 = 14 2/3 - 10 1/8 = 4 1/15
2) 81/88 × ( 6 - 1 13/15 × 1 19/21) = 81/88 × (6 - 1 28/15 × 40/21) = 81/88 × (6 - 60 + 80/7) = 81/88 × (6 - 60 + 80/7) = 81/88 × ( - 54 + 80/7) = 81/88 × ( - 54 + 11 3/7) = 81/88 × 11 3/7 = 81/88 × 80/7 = 9/11 × 80/7 = 720/77
3) ( 5 1/16 - 1 1/8)(5/6 3/14) = (81/16 - 9/8)(11/42) = (81/16 - 18/16)(11/42) = 63/16 × 11/42 = 63/8 × 11/42 = 693/336 = 77/48
4) 5 1/16 - 1 1/8 × ( 5/6 3/14) = 81/16 - 9/8 × 11/42 = 81/16 - 3/8 = 123/16 - 6/16 = 117/16 = 7 5/16
1) 15 4/9 - 4 4/9 × 3 3/8 = 15 4/9 - 4 4/9 × 27/8 = 15 4/9 - 18/9 × 27/8 = 15 4/9 - 81/8 = 141/9 - 81/8 = 126/9 - 81/8 = 14 2/3 - 10 1/8 = 4 1/15
2) 81/88 × ( 6 - 1 13/15 × 1 19/21) = 81/88 × (6 - 1 28/15 × 40/21) = 81/88 × (6 - 60 + 80/7) = 81/88 × (6 - 60 + 80/7) = 81/88 × ( - 54 + 80/7) = 81/88 × ( - 54 + 11 3/7) = 81/88 × 11 3/7 = 81/88 × 80/7 = 9/11 × 80/7 = 720/77
3) ( 5 1/16 - 1 1/8)(5/6 3/14) = (81/16 - 9/8)(11/42) = (81/16 - 18/16)(11/42) = 63/16 × 11/42 = 63/8 × 11/42 = 693/336 = 77/48
4) 5 1/16 - 1 1/8 × ( 5/6 3/14) = 81/16 - 9/8 × 11/42 = 81/16 - 3/8 = 123/16 - 6/16 = 117/16 = 7 5/16