Will the neighbors give us some candy as a treat?

Will the neighbors give us some candy as a treat?

Will they neighbours treat us with some candies?

Simple calculation of 99.99 * 88.88 / 11.11

Original formula = 9x11.11x8x11.11 / 11.11
=11.11x9x8/11.11
=72/1
=72
Questioning, questioning;
Method error, calculation error, please comment,

Such as 2, 5, 8, 11, 14, 17, 20 --- the 50th number

2. 5, 8, 11, 14, 17, 20 are arithmetic sequences
It can be seen that if the difference is 3, then the 50th number = 2 + 3 × 49 = 149

1/2*5+1/5*8+1/8*11+1/11*14+.+1/17*20=?

Original formula = 1 / 3 (1 / 2-1 / 5 + 1 / 5-1 / 8 + 1 / 11-1 / 14 +...) +1/17-1/20）
=1/3（1/2-1/20）
=3/20

1/2 × 1/5 ＋ 1/5 × 1/8 ＋ 1/8 × 1/11 ＋ 1/11 × 1/14 ＋ 1/14 × 1/17

=1/3×(1/2-1/5+1/5-1/8+1/8-1/11+1/11-1/14+1/14-1/17)
=1/3×(1/2-1/17)
=1/3×(15/34)
=5/34

[1+3+5+.99]-【2+4+6+.98】=

[1+3+5+.99]-【2+4+6+.98】
＝1-2+3-4+5-6+..97-98+99
＝-49+99
＝50

What is (1 / 10-1) × (1 / 11-1) × (1 / 12-1) ··× (1 / 99-1) × (1 / 100-1)?

（1／10-1）×（1／11-1）×（1／12-1）···×（1／99-1）×（1／100-1）
=（-9/10）×（-10/11）×…… When the number of × (- 99 / 100) numbers is odd, the product is negative
The numerator and denominator of two adjacent fractions are reduced, leaving the numerator of the first fraction and the denominator of the last fraction
= -9/100

-20 + (- 17) - (- 18) - 11 = - (1 and 1 / 3) △ 0.8 × (- 6 / 7)
-16 + 3 × (- 4) + (- 6) / (- 1 / 6) - 1 - [2 - (1 / 3 × 0.5)] × [6 - (- 4)] - 20 + (- 17) - (- 18) - 11 (- 1 / 3) / 0.8 × (- 6 / 7)

1. 16 + 3 × (- 4) + (- 6) ÷ (- 1 / 6) = 12
2. - 1 - [2 - (1 / 3 × 0.5)] × [6 - (- 4)] = - 38 / 3
3、-20+（-17）-（-18）-11 =-30
4. (- 1 / 3) △ 0.8 × (- 6 / 7) = 10 / 7

2/5+3/7+2/9+5/7+3/5+11/15+12/17+1/9+2/5+4/7+3/8=?

284/237

1,2,4,7,11,16.3,5,8,12,17.6,9,13,18.10,14,19.15,20.21. Among them, 8 is in the second column and the third row. 1. Which column and row is 2014? Solve and explain how to do it

Mark, do it later. It's interesting