Question

(1,5 điểm) Tính bằng cách hợp lí (nếu có thể):

a) $A=2,34+5,35+7,66+4,65$

b) $B=2,13.75+2,13.25$

c) $C=\dfrac{1}{3}-\dfrac{1}{3}: \dfrac{3}{4}$

Answer 1

a, A = (2,34 + 7,66) + (5,35 + 4,65)

A = 10 + 10

A = 20

b, B = 2,13 . (75 + 25)

B = 2,13 . 100

B = 213

c, C = 2/3 - 4/9

C = 2/9

Answer 2

A=\((\)2,34+7,66\()\)+\((\)5,35+4,65\()\)

A=10+10

A=20

B=2,13*\((\)75+65\()\)

B=2,13*140

B=298,2

C=\(\dfrac{2}{3}\)-\(\dfrac{4}{9}\)

C=\(\dfrac{2}{9}\)

Answer 3

a,=10+10

=20

b,=2,13.100

=213

c,2/3-4/9

=2/9

Answer 4

c

Answer 5

a) A= 2,34 + 5,35 + 7,66 + 4,65

A = ( 2,34 + 7,66 ) + ( 5,35 + 4,65 )

A = 10 + 10

A = 20.

b) B = 2,13 .75 + 2,13 . 25

B = 2,13 . ( 75 + 25 ) 

B = 2,13 . 100

B = 213.

c) C = 1/3 - 1/3 : 3/4

C = ( 1/3 -1/3 ) : 3/4

C = 0 : 3/4

C = 0.

Answer 6

a. A = 2,34+5,35+7,66+4,65                                                      B = 2,13.75+2,13.25                                          

   A = (2,34+7,66)+(5,35+4,65)                                                   B = 2,13.(75+25)                                              

    A =        10        +       10                                                          B = 2,13.100

    A =                 20                                                                       B = 213

             

Answer 7

a) $A=2,34+5,35+7,66+4,65$

$=(2,34+7,66)+(4,65+5,35)$

$=10+10$

$=20$

b) $B=2,13.75+2,13.25$

$=2,13.(75+25)$

$=2,13.100$

$=213$

Answer 8

a) $A=2,34+5,35+7,66+4,65$

b) $B=2,13.75+2,13.25$

c) C=\dfrac{1}{3}-\dfrac{1}{3}: \dfrac{3}{4}C=31​−31​:43​

Hướng dẫn giải:

a) $A=2,34+5,35+7,66+4,65$

$=(2,34+7,66)+(4,65+5,35)$

$=10+10$

$=20$

b) $B=2,13.75+2,13.25$

$=2,13.(75+25)$

$=2,13.100$

$=213$

c) C=\dfrac{1}{3}-\dfrac{1}{3}: \dfrac{3}{4}C=31​−31​:43​

=\dfrac{1}{3}-\dfrac{1}{3}. \dfrac{4}{3}=31​−31​. 34​

=\dfrac{1}{3}-\dfrac{4}{9}=31​−94​

=\dfrac{3}{9}-\dfrac{4}{9}=93​−94​

=\dfrac{-1}{9}=9−1​

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Answer 9

a) $A=2,34+5,35+7,66+4,65$

b) $B=2,13.75+2,13.25$

c) C=\dfrac{1}{3}-\dfrac{1}{3}: \dfrac{3}{4}C=31​−31​:43​

Hướng dẫn giải:

a) $A=2,34+5,35+7,66+4,65$

$=(2,34+7,66)+(4,65+5,35)$

$=10+10$

$=20$

b) $B=2,13.75+2,13.25$

$=2,13.(75+25)$

$=2,13.100$

$=213$

c) C=\dfrac{1}{3}-\dfrac{1}{3}: \dfrac{3}{4}C=31​−31​:43​

=\dfrac{1}{3}-\dfrac{1}{3}. \dfrac{4}{3}=31​−31​. 34​

=\dfrac{1}{3}-\dfrac{4}{9}=31​−94​

=\dfrac{3}{9}-\dfrac{4}{9}=93​−94​

=\dfrac{-1}{9}=9−1​

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Answer 10

a) $A=2,34+5,35+7,66+4,65$

b) $B=2,13.75+2,13.25$

c) C=\dfrac{1}{3}-\dfrac{1}{3}: \dfrac{3}{4}C=31​−31​:43​

Hướng dẫn giải:

a) $A=2,34+5,35+7,66+4,65$

$=(2,34+7,66)+(4,65+5,35)$

$=10+10$

$=20$

b) $B=2,13.75+2,13.25$

$=2,13.(75+25)$

$=2,13.100$

$=213$

c) C=\dfrac{1}{3}-\dfrac{1}{3}: \dfrac{3}{4}C=31​−31​:43​

=\dfrac{1}{3}-\dfrac{1}{3}. \dfrac{4}{3}=31​−31​. 34​

=\dfrac{1}{3}-\dfrac{4}{9}=31​−94​

=\dfrac{3}{9}-\dfrac{4}{9}=93​−94​

=\dfrac{-1}{9}=9−1​

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Answer 11

a) $A=2,34+5,35+7,66+4,65$

b) $B=2,13.75+2,13.25$

c) C=\dfrac{1}{3}-\dfrac{1}{3}: \dfrac{3}{4}C=31​−31​:43​

Hướng dẫn giải:

a) $A=2,34+5,35+7,66+4,65$

$=(2,34+7,66)+(4,65+5,35)$

$=10+10$

$=20$

b) $B=2,13.75+2,13.25$

$=2,13.(75+25)$

$=2,13.100$

$=213$

c) C=\dfrac{1}{3}-\dfrac{1}{3}: \dfrac{3}{4}C=31​−31​:43​

=\dfrac{1}{3}-\dfrac{1}{3}. \dfrac{4}{3}=31​−31​. 34​

=\dfrac{1}{3}-\dfrac{4}{9}=31​−94​

=\dfrac{3}{9}-\dfrac{4}{9}=93​−94​

=\dfrac{-1}{9}=9−1​

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Answer 12

a) $A=2,34+5,35+7,66+4,65$

b) $B=2,13.75+2,13.25$

c) C=\dfrac{1}{3}-\dfrac{1}{3}: \dfrac{3}{4}C=31​−31​:43​

Hướng dẫn giải:

a) $A=2,34+5,35+7,66+4,65$

$=(2,34+7,66)+(4,65+5,35)$

$=10+10$

$=20$

b) $B=2,13.75+2,13.25$

$=2,13.(75+25)$

$=2,13.100$

$=213$

c) C=\dfrac{1}{3}-\dfrac{1}{3}: \dfrac{3}{4}C=31​−31​:43​

=\dfrac{1}{3}-\dfrac{1}{3}. \dfrac{4}{3}=31​−31​. 34​

=\dfrac{1}{3}-\dfrac{4}{9}=31​−94​

=\dfrac{3}{9}-\dfrac{4}{9}=93​−94​

=\dfrac{-1}{9}=9−1​

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Answer 13

a) $A=2,34+5,35+7,66+4,65$

b) $B=2,13.75+2,13.25$

c) C=\dfrac{1}{3}-\dfrac{1}{3}: \dfrac{3}{4}C=31​−31​:43​

Hướng dẫn giải:

a) $A=2,34+5,35+7,66+4,65$

$=(2,34+7,66)+(4,65+5,35)$

$=10+10$

$=20$

b) $B=2,13.75+2,13.25$

$=2,13.(75+25)$

$=2,13.100$

$=213$

c) C=\dfrac{1}{3}-\dfrac{1}{3}: \dfrac{3}{4}C=31​−31​:43​

=\dfrac{1}{3}-\dfrac{1}{3}. \dfrac{4}{3}=31​−31​. 34​

=\dfrac{1}{3}-\dfrac{4}{9}=31​−94​

=\dfrac{3}{9}-\dfrac{4}{9}=93​−94​

=\dfrac{-1}{9}=9−1​

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Answer 14

a) $A=2,34+5,35+7,66+4,65$

b) $B=2,13.75+2,13.25$

c) C=\dfrac{1}{3}-\dfrac{1}{3}: \dfrac{3}{4}C=31​−31​:43​

Hướng dẫn giải:

a) $A=2,34+5,35+7,66+4,65$

$=(2,34+7,66)+(4,65+5,35)$

$=10+10$

$=20$

b) $B=2,13.75+2,13.25$

$=2,13.(75+25)$

$=2,13.100$

$=213$

c) C=\dfrac{1}{3}-\dfrac{1}{3}: \dfrac{3}{4}C=31​−31​:43​

=\dfrac{1}{3}-\dfrac{1}{3}. \dfrac{4}{3}=31​−31​. 34​

=\dfrac{1}{3}-\dfrac{4}{9}=31​−94​

=\dfrac{3}{9}-\dfrac{4}{9}=93​−94​

=\dfrac{-1}{9}=9−1​

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Answer 15

a 2,34+7,66+5,35+4,65=20
b 2,13.(75+25)=213
c 1/3-1/3x4/3=1/3-4/9
=1/3.(1-4/3)
=1/3.-1/3
=-1/9

Answer 16

    

Answer 17

A= 20

B= 213

C= -1/9

Answer 18

a)A=20

 b)B=213

c)C=1/9

 

Answer 19

 

a) $A=2,34+5,35+7,66+4,65$

$=(2,34+7,66)+(4,65+5,35)$

$=10+10$

$=20$

b) $B=2,13.75+2,13.25$

$=2,13.(75+25)$

$=2,13.100$

$=213$

c) �=13−13:34C=31​−31​:43​

=13−13. 43=31​−31​. 34​

=13−49=31​−94​

=39−49=93​−94​

=−19=9−1​
 

Answer 20

a) 2,34+5,35+7,66+4,65
=(2,34+7,66)+(5,35+4,65)

=10+10

=20

Answer 21

a, A=2,34+5,35+7,66+4,65

A=(2,34+7,66)+(5,35+4,65)

A=10+10=20

b,B=2,13.75+2,13.25

B=2,13.(75+25)

B=2,13.100

B=213

c,C=\(\dfrac{1}{3}-\dfrac{1}{3}:\dfrac{3}{4}\) 

C=\(\dfrac{1}{3}-\dfrac{1}{3}.\dfrac{4}{3}\) 

C=\(\dfrac{1}{3}-\dfrac{4}{9}\)

C=\(\dfrac{3}{9}-\dfrac{4}{9}\)

C=\(\dfrac{-1}{9}\)

Answer 22

a) A = 2,34 + 5,35 +7,66 + 4,65

    A = ( 2,34 + 7,66 ) + ( 5,35 + 4,65 )

    A = 10 + 10

    A = 20

b) B = 2,13 . 75 + 2,13 . 25

    B = 2,13 . ( 75 + 25 )

    B = 2,13 . 100

    B = 213

c) C = \(\dfrac{1}{3}-\dfrac{1}{3}:\dfrac{3}{4}\)  

    C = \(\dfrac{1}{3}-\dfrac{1}{3}.\dfrac{4}{3}\)

    C = \(\dfrac{1}{3}-\dfrac{4}{9}\)

    C = \(\dfrac{3}{9}-\dfrac{4}{9}\)

    C = \(\dfrac{-1}{9}\)

Answer 23

a) 20 
b) 213
c) -1/9

Answer 24

a)A= (2,34+7,66)+(5,65+4,35)=10+10=20.

b)B=2,13.(75+25)=2,13.100=213.

c)1/3-1/3.4/3=1/3-(-1/3)=0.

 

Answer 25

  

Answer 26

A= 10+10= 20

B=2,13.100

b=213

C=2/3-4/9

c=2/9

 

Answer 27

 A = (2,34 + 7,66) + (5,35 + 4,65)

A = 10 + 10

A = 20

B = 2,13 . (75 + 25)

B = 2,13 . 100

B = 213

 C = 2/3 - 4/9

C = 2/9

Answer 28

 A = (2,34 + 7,66) + (5,35 + 4,65)

A = 10 + 10

A = 20

B = 2,13 . (75 + 25)

B = 2,13 . 100

B = 213

 C = 2/3 - 4/9

C = 2/9

Answer 29

 A = (2,34 + 7,66) + (5,35 + 4,65)

A = 10 + 10

A = 20

B = 2,13 . (75 + 25)

B = 2,13 . 100

B = 213

 C = 2/3 - 4/9

C = 2/9

Answer 30

 A = (2,34 + 7,66) + (5,35 + 4,65)

A = 10 + 10

A = 20

B = 2,13 . (75 + 25)

B = 2,13 . 100

B = 213

 C = 2/3 - 4/9

C = 2/9