=5.(1+1/23+1/27+1/2018)

_______________________=5/7

7.(1+1/23+1/27+1/2018)

giúp mình với

\(\frac{5.\left(1+\frac{1}{23}+\frac{1}{27}+\frac{1}{2018}\right)}{7.\left(1+\frac{1}{23}+\frac{1}{27}+\frac{1}{2018}\right)}\)

=5/7

=-1/54

tk  mk nha

\(\frac{23.5-23}{-27}\)

\(=\frac{23.\left(5-1\right)}{-27}\)

\(=\frac{23.4}{-27}\)

\(=\frac{92}{-27}\)

\(=\frac{-92}{27}\)

bn ơi / đây là chia hay phần??

Nếu đề là \(\frac{23.5-23}{4-27}\) thì ok :v

\(\frac{23.5-23}{4-27}=\frac{23.5-23}{-23}=\frac{23.\left(5-1\right)}{-23}=\frac{23.4}{-23}=\frac{92}{-23}\)

ngu vãi lol dễ vậy ko bt làm

a) `27 .75 + 25.27 -150`

`=27 xx (75 + 25)-150`

`=27 xx 100-150`

`=2700-150`

`=2550`

b) `142-[50-(2^3 .10-2^3 .5)]`

`=142-[50-2^3 .(10-5)]`

`=142-(50-8 .5)`

`=142-(50-40)`

`=142-10`

`=132`

c) `375:{32-[4+(5.3^2-42)]}-14`

`=375:{32-[4+(45-42)]}-14`

`=375:[32-(4+3)]-14`

`=375: 25 -14`

`=15-14`

`=1`

a. 27 . 75 + 25 . 27 - 150

= 27. (75 + 25) - 150

= 27 . 100 - 150

= 2700 - 150

= 2550

b. 142 - [50 - (2³.10 - 2³.5)]

= 142 - [50 - (8 . 10 - 8 . 5)]

= 142 - {50 - [8 . (10 - 5)]} 

= 142 - (50 - 40)

= 142 - 10

= 132

c. 375 : {32 – [ 4 + (5. 3² – 42)]} – 14

= 375 : {32 – [ 4 + (5. 9 – 42)]} – 14

= 375 : {32 – [ 4 + (45 – 42)]} – 14

= 375 : {32 – [ 4 + 3]} – 14

= 375 : {32 –7} – 14

= 375 : 25 - 14

= 15 - 14

= 1

23-23.5 phần 4-27=23.(1-5)phần -23=23.-4 phần -23=-23.4 phần -23=4

Đáp số 4

\(\frac{23.5-23}{4-27}\)=\(\frac{23.\left(5-1\right)}{-23}\)=\(\frac{92}{-23}\)

A = 2 1.3 + 2 3.5 + 2 5.7 + ... + 2 99.101 = 1 − 1 3 + 1 3 − 1 5 + 1 5 − 1 7 + ... + 1 99 − 1 101 = 1 − 1 101 = 100 101