How to calculate 999 and 1 / 9 divided by (- 1 / 9)

How to calculate 999 and 1 / 9 divided by (- 1 / 9)

999 1 / 9 divided by (- 1 / 9)
=-999 1 / 9 × 9 / 10
=（-1000+8/9)×9/10
=-1000×9/10+8/9×9/10
=-900+0.8
=-899.2

How to do 999 times 99 plus 199

Calculator calculation

799 + 9999 + 999 + 999 + 99 + 9 + 6 times 800

800+10000+1000+1000+100+10-5+6*800=11110+560-5=11665

9.9 + 9.99 + 9.999 +... + 9. A total of 20 9 =?

Your "+ 9. A total of 20 9s" means that the decimal point is 20 9s. No? I'll do it for the time being. The original formula = 10 * 20-0.11111111. (20 1) = 199.888.88889 (a total of 19 8)