99,999

mỗi người 1 cái nhé

99999 : 1000 = 99,999

k mình nhse , sẽ k lại

99999:1000=99,999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999

bằng này số 9 chắc đủ rồi

giải cho mình đi

giải câu d cho mình

99999 - 9 - 9 - 9 -...- 9

= 99999 - ( 9 * 1000 )

= 99999 - 9000

= 90999

Từ 1000 đến 99999 :

Số nhỏ nhất chia hết cho 3 là : 1002

Số lớn nhất  chia hết cho 3 là : 99999

Số các số từ 1000 đến 99999 chia hết cho 3 là :

\(\frac{99999-1002}{3}+1=33000\)( số )

Đáp số : 33 000 số .

=11111111....1111(có 99 so1)20000000000.......00000(có 500 số 9)

  có 500 số 0 mới đúng

Số số hạng có 4 chữ số là:

(9999-1000)+1=9000(số)

Số số hạng có 5 chữ số là:

(99999-10000)+1=90000(số)

Cần dùng số chữ số là:

9000.4+90000.5=486000(chữ số)

ĐS: 486000 chữ số

từ 1000 đến 9999 có tất cả: (9999-1000)/1+1=9000(số)

  nên cần dùng tất cả số chữ số là: 4*9000=36 000(chữ số)

từ 10 000 đến 99 999 có tất cả: (99 999-10 000)/1+1=90 000(số)

   nên cần dùng tất cả số chữ số là: 5*90 000=450 000(chữ số)

vậy từ 1000 đến 99 999 thì cần dùng tất cả số chữ số là:

       36 000+ 450 000=486 000(chữ số)

                           Đáp số: 486 000 chữ số

Số 0 lớn hơn vì:

\(\left(-1\right)^{999}\) là số âm

\(\left(-99999\right)^{1000}\) là số dương

Mà số âm x số dương = số âm

nên => số 0 lớn hơn

(-1)⁹⁹⁹x(-99999)¹⁰⁰⁰ < 0 

Vì (-1)⁹⁹⁹ có số mũ là lẻ nên tích sẽ là số nguyên  âm

(-99999)¹⁰⁰⁰ có số mũ là chẵn nên tích là số nguyên dương

Mà số nguyên âm x số nguyên dương được tích là số nguyên âm

\(\Rightarrow\)(-1)⁹⁹⁹x(-99999)¹⁰⁰⁰ < 0

minh ko biet xin loi moi hoc lop 5 nhe 

(-99999)^1000 < (-1)^999 <0

\(...=\left(9797+1\right).9897-9797.\left(9897+1\right)\)

\(=9797.9897+9897-9797.9897-9797\)

\(=9897-9797=100\)