33333 × 6 × 11111 + 22222, please 3Q The result is 2222200000, and it is fast

33333 × 6 × 11111 + 22222, please 3Q The result is 2222200000, and it is fast

33333×6×11111＋22222 =(99999+1)x22222 =100000x22222 =2222200000

5+55+555+5555+55555=

61728

5+5+55+555+5555+55555+555555=?

?

Seek 5 + 55 + 555 + 5555 +Value of 5555

Let the nth term in the formula be an
Then an = 5 / 9 × [(10 ^ n) - 1]
You can try it
Here n goes from 1 to 10
So S10 = 5 / 9 × (10 + 10 & # 178; +...) +10^10-1×10）
=5/9×（10+10²+10³+…… +10^10-10）
=5/9×[（10（1-10^10）/(1-10) ）-10]
=5/9×（10×1111111111-10）
=5/9×11111111100
=6172839500