Question 1: 33333 * 66666 Question 2: 1997 * 1998 1998-1998 * 1997 1997 1997 Question 3: 1 * 2 / 1 + 2 * 3 / 1 + 3 * 4 / 1 +99 * 1 / 100 Question 4: (7 / 4 - 7 / 8 - 7 / 12) * ([minus sign] 8 / 7) Question 5: the square of (- 3) * [(- 2 / 3) + (- 5 / 9)] Question 6: (5 / 9 - 5 / 6 + 1 / 4) divided by (- 1 / 36) Question 7: (- 19 and 18 / 19) * 38

Question 1: 33333 * 66666 Question 2: 1997 * 1998 1998-1998 * 1997 1997 1997 Question 3: 1 * 2 / 1 + 2 * 3 / 1 + 3 * 4 / 1 +99 * 1 / 100 Question 4: (7 / 4 - 7 / 8 - 7 / 12) * ([minus sign] 8 / 7) Question 5: the square of (- 3) * [(- 2 / 3) + (- 5 / 9)] Question 6: (5 / 9 - 5 / 6 + 1 / 4) divided by (- 1 / 36) Question 7: (- 19 and 18 / 19) * 38

First question
Split 66666: 33333 × 3 × 22222 = 99999 × 22222 = (100000-1) × 22222 = 2222200000-22222 = 2222177778
Second question
Split 1998 1998 and 1997 1997: 1997 × (1998 × 10001) - 1998 × (1997 × 10001) = 0
The third question
The same solution as jz330523
The fourth question
(7/4)×(-8/7)-(7/8)×(-8/7)-(7/12)×(-8/7)=-2+1+2/3=-1/3
Questions 5 and 6
The same solution as jz330523
Question 7
-(19×19+18)/19×38=-(19×19+18)×2=-758