The results are as follows: (1), 3.2 * (- 7 / 8) * (- 1.25) * (1 / 7) (2) (7 / 99 / 15) * 30 (3), (- 69 / 15) * 8 Using a simple method to calculate: (1), 3.2 * (- 7 / 8) * (- 1.25) * (1 and 1 / 7) (2) (99 and 7 / 15) * 30 (just two, not the third)

The results are as follows: (1), 3.2 * (- 7 / 8) * (- 1.25) * (1 / 7) (2) (7 / 99 / 15) * 30 (3), (- 69 / 15) * 8 Using a simple method to calculate: (1), 3.2 * (- 7 / 8) * (- 1.25) * (1 and 1 / 7) (2) (99 and 7 / 15) * 30 (just two, not the third)

(1)=3.2*1.25*7/8*8/7=4*0.8*1.25=4
(2) = (7 / 99 + 15) * 30 = 99 * 30 + 7 / 15 * 30 = 2970 + 14 = 2984