1A

2B

3B

4D

5A

...dài quá, em tách ra dùm a =')

1.202200

2.3780

\(2022\cdot99+2022=2022\left(99+1\right)=2022\cdot100=202200\)

\(135\cdot3^3+5\left(3^3\cdot4-3^4\right)\)

\(=135\cdot3^3+5\cdot3^3\cdot4-5\cdot3^4\)

\(=3^3\cdot\left(135+5\cdot4-5\cdot3\right)=3^3\cdot140=1260\)

1.  Tính nhanh :
2022 . 99 + 2022
= 2022 . (99 + 1)
= 2022 . 100
= 202200

2. Thực hiện phép tính :
135 . 3³ + 5 . ( 3³. 4 - 3⁴ )
= 135 . 27 + 5 . ( 27 . 4 - 81 )
= 3645 + 5 . ( 108 - 81 )
= 3645 + 5 . 27
= 3645 + 135
= 3780

n-2 chia het cho n+3 

nen n+3-5 chia het cho n+3

5 chia het cho n+3

n+3 =cong tru1 cong tru 5

roi tim n

=211 nếu đúng thì k ha

= ((5,2 x 5 + 0,25 ) x 4 + 1/2 ) x 2 

= ( 26,25 x 4 + 0,5) x 2

= 105,5 x 2

= 211

{[( 5 + 1/5 ) * 5 + 1/4 ] * 4 + 1/2 }*2

={[ 26/5 * 5 + 1/4 ] * 4 + 1/2 } * 2

={[ 26 + 1/4 ] * 4 + 1/2 } * 2

={ 105/4 * 4 + 1/2 } * 2

={ 105 + 1/2} * 2

= 211/2 * 2

= 211

_Hok tốt_

135:33:3= 135x1/33x1/3= 135/99

a)

-37 +14 +26+37=(-37+37)+(14+26)=30

b) =(-24+24)+(6+10)=16

c)=(-23+23)+(25+15)=40

d)=(-33+33)+(-50+60)=10

e)=(-209+209)+[-14+(-16)]=-30

1) ( - 37 ) + 14 + 26 + 37

= ( - 37 + 37 ) + 14 + 26

= 0 + 40

= 40

2) ( - 24 ) + 6 + 10 + 24

= ( - 24 + 24 ) + 6 + 10

= 0 + 16

= 16

3) 15 + 23 + ( - 25 ) + ( - 23 )

= ( 23 - 23 ) + ( 15 - 25 )

= 0 - 10

= - 10

4) 60 + 33 + ( - 50 ) + ( - 33 )

= ( 60 - 50 ) + ( 33 - 33 )

= 10 + 0

= 10

( - 16 ) + ( - 209 ) + ( - 14 ) + 209

= ( - 16 - 14 ) + ( - 209 + 209 )

= - 30 + 0

= - 30

a) \(-1\frac{1}{15}:2\frac{1}{2}=-\frac{16}{15}:\frac{5}{2}=-\frac{16}{15}\cdot\frac{2}{5}=-\frac{32}{75}\)

b) \(\frac{1}{3}-\frac{5}{14}\cdot\frac{21}{25}=\frac{1}{3}-\frac{1}{2}\cdot\frac{3}{5}=\frac{1}{3}-\frac{3}{10}=\frac{1}{30}\)

c) \(\frac{-5}{7}\cdot\frac{2}{11}+\frac{-5}{7}\cdot\frac{9}{11}+1\frac{5}{7}\)

\(=-\frac{5}{7}\left(\frac{2}{11}+\frac{9}{11}\right)+\frac{12}{7}\)

\(=-\frac{5}{7}\cdot1+\frac{12}{7}=-\frac{5}{7}+\frac{12}{7}=\frac{7}{7}=1\)

d) \(8\frac{1}{4}-\left(2\frac{5}{9}+3\frac{1}{4}\right)=8\frac{1}{4}-2\frac{5}{9}-3\frac{1}{4}=\left(8\frac{1}{4}-3\frac{1}{4}\right)-2\frac{5}{9}\)

\(=5-2\frac{5}{9}=5-\frac{23}{9}=\frac{22}{9}\)

e) \(\frac{1}{4}\cdot\frac{12}{13}+\frac{1}{4}\cdot\frac{1}{13}-25=\frac{1}{4}\left(\frac{12}{13}+\frac{1}{13}\right)-25=\frac{1}{4}\cdot1-25=\frac{1}{4}-25=-\frac{99}{4}\)

bn ơi sao câu b ở đâu ra 1/2 vậy

Trương Bùi Linh Đây :

\(\frac{5}{14}.\frac{21}{25}=\frac{5}{2.7}.\frac{3.7}{5.5}=\frac{1}{2}.\frac{3}{5}\)