45*58+34*45+8*45-134000: (67*78-68*67) =

45*58+34*45+8*45-134000: (67*78-68*67) = -128.830

1. 67*78=5226

2. 68*67=4556

3. 5226-4556=670

4. 45*58=2610

5. 34*45=1530

6. 8*45=360

7. 134000-670=133.330

8. 2610+1530=4140

9. 4140+360=4500

10. 4500-133.330=-128.830