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13 tháng 1 2016

nhờ các bạn giải ra giùm mình với

4 tháng 5 2021

[ 1 + 100 ] x 100 = 10100 l i k e nhe

`@` `\text {Ans}`

`\downarrow`

`A.`

`100-99+98-97+96-95+...+4-3+2-1 ?`

Ta có:

Số phần tử của bt trên là: `(100 - 1) \div 1 + 1 = 100 (\text {phần tử})`

Mà mỗi phần tử ghép với nhau thành `1` cặp

`=>` `100 \div 2 = 50 (\text {cặp})`

`100-99+98-97+96-95+...+4-3+2-1 `

`= (100 - 99) + (98 - 97) + ... + (4-3) + (2-1)`

`= 1+1+1 + ... + 1 + 1`

Mà bt trên có `50` cặp

`=>` Có `50` số `1`

`=>` Giá trị của bt trên là `50`

`B.`

`100-98+96-94+...+4-2`

Ta có:

Số phần tử của bt trên là: `(100 - 2) \div 2 + 1 = 50 (\text {phần tử})`

Mỗi phần tử ghép với nhau thành `1` cặp

`=> 50 \div 2 = 25 (\text {cặp})`

`100-98+96-94+...+4-2`

`= (100 - 98) + (96 - 94) + ... + (4 -2)`

`= 2 + 2 + ... + 2`

Mà bt trên có `25` cặp

`=>` Giá trị của bt trên là: `2 \times 25 = 50.`

a) \(100-99+98-97+...+4-3+2-1=\)

\(\left(100-99\right)+\left(98-97\right)+...+\left(4-3\right)+\left(2-1\right)=\)

\(1+1+1+...+1+1\left(50con1\right)=50\)

b) Ta xen các số lẻ vào các số chẵn :

\(100+98-97+96-95+...+2-1=\)

\(100+\left(98-97\right)+\left(96-95\right)+...+\left(2-1\right)=\)

\(100+1+1+1+...+1\left(49con1\right)=149\)

Ủng hộ mik nha

28 tháng 8 2016

a)=-100

b)=101

19 tháng 9 2017

100 - 99 + 98 - 97 + 96 - ... + 6 - 5 + 4 - 3 + 2 - 1

= ( 100 - 99 ) + ( 98 - 97 ) + ( 96 - 95 ) + ... + ( 6 - 5 ) + ( 4 - 3 ) + ( 2 - 1 )

= 1 + 1 + 1 + ... + 1 + 1 + 1

Dãy số trên có số số hạng là :

( 100 - 1 ) : 1 + 1 = 100 ( số )

Vậy ....

2 tháng 11 2023

hmmmmmmmmmmmmmmmmmmmmmmm 

15 tháng 1 2019

=(1+98-99-100)+(2-3-4+5)+(6-7-8+9)+...+(95-96-97+98)

=-100+0+0+0+0+0.........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................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5 tháng 10 2016

100-99+98-97+96-95+...........+4-3+2-1

= ( 100 - 99 ) + ( 98 - 97 ) + ( 96 - 95 ) + ... + ( 4- 3 ) + ( 2 - 1 )

= 1 + 1 + 1 + ... + 1 + 1

có 50 số 1

= 1 x 50

= 50

5 tháng 10 2016

100-99+98-97+96-65+...........+4-3+2-1=(100-99)+(98-97)+...+(2-1)

                                                        = 1 + 1 + 1 + ... + 1 ( 50 cặp )

                                                        = 1 x 50 

                                                        = 50

5 tháng 10 2016

    100-99+98-97+96-95+.......+4-3+2-1

=1+1+1+......+1+1

=50